Allow specifying Google Cloud project ID to runnerCloudProvisioningOptions query

Following up on #438315 (closed), and given the designs in #426163 (comment 1762268040), we'll need to allow specifying a Google Cloud project ID on the runnerCloudProvisioningOptions query, and underlying services:

{
  project(fullPath: "gitlab-org/playground") {
    id
    runnerCloudProvisioningOptions(
      provider: GOOGLE_CLOUD
      cloudProjectId: "dev-gcp-s3c-integrati-9abafed1"
    ) {
      ... on CiRunnerGoogleCloudProvisioningOptions {
        regions(first: 2) {
          nodes {
            name
            description
          }
          pageInfo {
            hasNextPage
            endCursor
          }
        }
        zones(region: "us-east1", first: 2) {
          nodes {
            name
            description
          }
          pageInfo {
            hasNextPage
            endCursor
          }
        }
        machineTypes(zone: "us-east1-b", first: 2) {
          nodes {
            name
            description
            zone
          }
          pageInfo {
            hasNextPage
            endCursor
          }
        }
      }
    }
  }
}

This is because the compute resources will not necessarily be created on the same project as where WLIF is setup (we even advise against it).