Get Google Cloud artifacts from project

What does this MR do and why?

Add a new field google_cloud_artifact_registry_repository_artifacts to the GraphQL Project type in order to fetch the Google Cloud repository artifacts.

MR acceptance checklist

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Screenshots or screen recordings

Successful GraphQL request

How to set up and validate locally

1. Required setup for Google Cloud is described here

2. Prepare the project with the Google Cloud Artifact Registry integration. The details on how to create a new integration are described here

3. Visit http://gdk.test:3000/-/graphql-explorer and create the request.

   query getGarArtifactsFromProject {
     project(fullPath: "gitlab-org/gitlab-test") {
       googleCloudArtifactRegistryRepository {
         projectId,
         repository,
         artifactRegistryRepositoryUrl,
         artifacts {
           nodes {
             ... on GoogleCloudArtifactRegistryDockerImage {
               name
               uri
               tags
               imageSizeBytes
               uploadTime
               mediaType
               buildTime
               updateTime
               projectId
               location
               repository
               image
               digest
               artifactRegistryImageUrl
             }
           },
           pageInfo {
             hasNextPage,
             startCursor,
             endCursor
           }
         }
       }
     }
   }

   The artifacts field supports the following arguments first, sort, after.

Related to #425149 (closed)