GraphQL: Use query field instead of mutation

What does this MR do and why?

This MR is a follow-up to !145598 (comment 1789427546) to replace the provisionGoogleCloudRunner mutation with the provisioningSteps query field. It also renames runnerCloudProvisioningOptions to runnerCloudProvisioning, since this is no longer only about options.

EE: true

Closes #438316 (closed)

Review status

Reviews	Reviewer	Status
backend (initial)	@10io
backend (maintainer)	@dmeshcharakou
frontend (maintainer)	@mrincon
devopsverify	@vshushlin
authorization	@jarka
groupimport and integrate	@bmarjanovic
documentation	@fneill

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

Screenshots are required for UI changes, and strongly recommended for all other merge requests.

Before	After

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

1. Run the following query in http://gdk.test:3000/-/graphql-explorer:

   {
     project(fullPath: "gitlab-org/playground") {
       id
       runnerCloudProvisioning(
         provider: GOOGLE_CLOUD
         cloudProjectId: "dev-gcp-s3c-integrati-9abafed1"
       ) {
         ... on CiRunnerGoogleCloudProvisioning {
           provisioningSteps(
             region: "us-central1"
             zone: "us-central1-a"
             ephemeralMachineType: "n2d-standard-2"
             runnerToken: "glrt-Ei-AAaaaaAAAaaAA"
           ) {
             title
             languageIdentifier
             instructions
           }
         }
       }
     }
   }

doc/api/graphql/reference/index.md

@@ -16515,20 +16515,20 @@ Zone used for runner cloud provisioning.
 | <a id="cirunnercloudprovisioningzonedescription"></a>`description` | [`String`](#string) | Description of the zone. |
 | <a id="cirunnercloudprovisioningzonename"></a>`name` | [`GoogleCloudZone`](#googlecloudzone) | Name of the zone. |
-### `CiRunnerGoogleCloudProvisioningOptions`
-Options for runner Google Cloud provisioning.
+### `CiRunnerGoogleCloudProvisioning`
+Information used for runner Google Cloud provisioning.
 #### Fields
 | Name | Type | Description |
 | ---- | ---- | ----------- |
-| <a id="cirunnergooglecloudprovisioningoptionsprojectsetupshellscript"></a>`projectSetupShellScript` | [`String`](#string) | Instructions for setting up a Google Cloud project. |
-| <a id="cirunnergooglecloudprovisioningoptionsregions"></a>`regions` | [`CiRunnerCloudProvisioningRegionConnection`](#cirunnercloudprovisioningregionconnection) | Regions available for provisioning a runner. (see [Connections](#connections)) |
+| <a id="cirunnergooglecloudprovisioningprojectsetupshellscript"></a>`projectSetupShellScript` | [`String`](#string) | Instructions for setting up a Google Cloud project. |
+| <a id="cirunnergooglecloudprovisioningregions"></a>`regions` | [`CiRunnerCloudProvisioningRegionConnection`](#cirunnercloudprovisioningregionconnection) | Regions available for provisioning a runner. (see [Connections](#connections)) |
 #### Fields with arguments
-##### `CiRunnerGoogleCloudProvisioningOptions.machineTypes`
+##### `CiRunnerGoogleCloudProvisioning.machineTypes`
 Machine types available for provisioning a runner.
@@ -16542,9 +16542,9 @@ four standard [pagination arguments](#pagination-arguments):
 | Name | Type | Description |
 | ---- | ---- | ----------- |
-| <a id="cirunnergooglecloudprovisioningoptionsmachinetypeszone"></a>`zone` | [`GoogleCloudZone!`](#googlecloudzone) | Zone to retrieve machine types for. |
-##### `CiRunnerGoogleCloudProvisioningOptions.provisioningSteps`
+| <a id="cirunnergooglecloudprovisioningmachinetypeszone"></a>`zone` | [`GoogleCloudZone!`](#googlecloudzone) | Zone to retrieve machine types for. |
+##### `CiRunnerGoogleCloudProvisioning.provisioningSteps`
 Steps used to provision a runner in the cloud.
@@ -16554,12 +16554,12 @@ Returns [`[CiRunnerCloudProvisioningStep!]`](#cirunnercloudprovisioningstep).
 | Name | Type | Description |
 | ---- | ---- | ----------- |
-| <a id="cirunnergooglecloudprovisioningoptionsprovisioningstepsephemeralmachinetype"></a>`ephemeralMachineType` | [`GoogleCloudMachineType!`](#googlecloudmachinetype) | Name of the machine type to use for running jobs. |
-| <a id="cirunnergooglecloudprovisioningoptionsprovisioningstepsregion"></a>`region` | [`GoogleCloudRegion!`](#googlecloudregion) | Name of the region to provision the runner in. |
-| <a id="cirunnergooglecloudprovisioningoptionsprovisioningstepsrunnertoken"></a>`runnerToken` | [`String`](#string) | Authentication token of the runner. |
-| <a id="cirunnergooglecloudprovisioningoptionsprovisioningstepszone"></a>`zone` | [`GoogleCloudZone!`](#googlecloudzone) | Name of the zone to provision the runner in. |
-##### `CiRunnerGoogleCloudProvisioningOptions.zones`
+| <a id="cirunnergooglecloudprovisioningprovisioningstepsephemeralmachinetype"></a>`ephemeralMachineType` | [`GoogleCloudMachineType!`](#googlecloudmachinetype) | Name of the machine type to use for running jobs. |
+| <a id="cirunnergooglecloudprovisioningprovisioningstepsregion"></a>`region` | [`GoogleCloudRegion!`](#googlecloudregion) | Name of the region to provision the runner in. |
+| <a id="cirunnergooglecloudprovisioningprovisioningstepsrunnertoken"></a>`runnerToken` | [`String`](#string) | Authentication token of the runner. |
+| <a id="cirunnergooglecloudprovisioningprovisioningstepszone"></a>`zone` | [`GoogleCloudZone!`](#googlecloudzone) | Name of the zone to provision the runner in. |
+##### `CiRunnerGoogleCloudProvisioning.zones`
 Zones available for provisioning a runner.
@@ -16573,7 +16573,7 @@ four standard [pagination arguments](#pagination-arguments):
 | Name | Type | Description |
 | ---- | ---- | ----------- |
-| <a id="cirunnergooglecloudprovisioningoptionszonesregion"></a>`region` | [`GoogleCloudRegion`](#googlecloudregion) | Region to retrieve zones for. Returns all zones if not specified. |
+| <a id="cirunnergooglecloudprovisioningzonesregion"></a>`region` | [`GoogleCloudRegion`](#googlecloudregion) | Region to retrieve zones for. Returns all zones if not specified. |
 ### `CiRunnerManager`
@@ -26392,22 +26392,22 @@ four standard [pagination arguments](#pagination-arguments):
 | <a id="projectrequirementsworkitemiid"></a>`workItemIid` | [`ID`](#id) | IID of the requirement work item, for example, "1". |
 | <a id="projectrequirementsworkitemiids"></a>`workItemIids` | [`[ID!]`](#id) | List of IIDs of requirement work items, for example, `[1, 2]`. |
-##### `Project.runnerCloudProvisioningOptions`
-Options for provisioning the runner on a cloud provider. Returns `null` if `:google_cloud_runner_provisioning` feature flag is disabled, or the GitLab instance is not a SaaS instance.
+##### `Project.runnerCloudProvisioning`
+Information used for provisioning the runner on a cloud provider. Returns `null` if `:google_cloud_runner_provisioning` feature flag is disabled, or the GitLab instance is not a SaaS instance.
 NOTE:
 **Introduced** in 16.9.
 **Status**: Experiment.
-Returns [`CiRunnerCloudProvisioningOptions`](#cirunnercloudprovisioningoptions).
+Returns [`CiRunnerCloudProvisioning`](#cirunnercloudprovisioning).
 ###### Arguments
 | Name | Type | Description |
 | ---- | ---- | ----------- |
-| <a id="projectrunnercloudprovisioningoptionscloudprojectid"></a>`cloudProjectId` | [`String!`](#string) | Identifier of the cloud project. |
-| <a id="projectrunnercloudprovisioningoptionsprovider"></a>`provider` | [`CiRunnerCloudProvider!`](#cirunnercloudprovider) | Identifier of the cloud provider. |
+| <a id="projectrunnercloudprovisioningcloudprojectid"></a>`cloudProjectId` | [`String!`](#string) | Identifier of the cloud project. |
+| <a id="projectrunnercloudprovisioningprovider"></a>`provider` | [`CiRunnerCloudProvider!`](#cirunnercloudprovider) | Identifier of the cloud provider. |
 ##### `Project.runners`
@@ -34150,13 +34150,13 @@ abstract types.
 ### Unions
-#### `CiRunnerCloudProvisioningOptions`
-Options for runner cloud provisioning.
+#### `CiRunnerCloudProvisioning`
+Information used in runner cloud provisioning.
 One of:
-- [`CiRunnerGoogleCloudProvisioningOptions`](#cirunnergooglecloudprovisioningoptions)
+- [`CiRunnerGoogleCloudProvisioning`](#cirunnergooglecloudprovisioning)
 #### `DependencyLinkMetadata`