GraphQL: Create field to return list of permissions required for Google Cloud project setup for runner provisioning

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In order to support this part of the UX design, we need to return a new field from runnerCloudProvisioningOptions, consisting of an array of permissions required to set up a GC project:

{
  project(fullPath: "gitlab-org/playground") {
    id
    runnerCloudProvisioningOptions(
      provider: GOOGLE_CLOUD
      cloudProjectId: "dev-gcp-s3c-integrati-9abafed1"
    ) {
      ... on CiRunnerGoogleCloudProvisioningOptions {
        requiredProjectPermissions
      }
    }
  }
}