Draft: Add cascading package settings to GraphQL

What does this MR do and why?

Adds GraphQL support for querying and updating the newest namespace package settings for package forwarding:

      mavenPackageRequestsForwarding
      lockMavenPackageRequestsForwarding
      npmPackageRequestsForwarding
      lockNpmPackageRequestsForwarding
      pypiPackageRequestsForwarding
      lockPypiPackageRequestsForwarding

These settings were added in !99274 (merged). They are implemented in the package logic in !99285 (merged). A separate MR will use this GraphQL update to expose these settings in the UI.

Screenshots or screen recordings

How to set up and validate locally

You will need the full path of a group and to be logged in with a user that has Owner access to that group.

In the graphql explorer (http://gdk.test:3000/-/graphql-explorer) query the settings:

query {
  namespace(fullPath: "<group_full_path>") {
    packageSettings {
      mavenPackageRequestsForwarding
      lockMavenPackageRequestsForwarding
      npmPackageRequestsForwarding
      lockNpmPackageRequestsForwarding
      pypiPackageRequestsForwarding
      lockPypiPackageRequestsForwarding
    }
  }
}

Update the settings:

mutation  updateNamespacePackageSettingsMutation ($namespacePackageSettings: UpdateNamespacePackageSettingsInput!) {
  updateNamespacePackageSettings(input:$namespacePackageSettings) {
    packageSettings {
      mavenPackageRequestsForwarding
      lockMavenPackageRequestsForwarding
      npmPackageRequestsForwarding
      lockNpmPackageRequestsForwarding
      pypiPackageRequestsForwarding
      lockPypiPackageRequestsForwarding
    }
  }
}

With these query variables:

{
  "namespacePackageSettings": {
    "namespacePath": "<group_full_path>",
    "mavenPackageRequestsForwarding": false,
    "lockMavenPackageRequestsForwarding": true,
    "npmPackageRequestsForwarding": false,
    "lockNpmPackageRequestsForwarding": true,
    "pypiPackageRequestsForwarding": false,
    "lockPypiPackageRequestsForwarding": true
  }
}

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #360267 (closed)