Address review feedback: Resolve N+1 issues

MR: Address N+1 query issues (!119434 - closed)

Address the following potential N+1 problems with WorkspaceType and other areas, which were found during review:

• !105783 (comment 1374842474)
  • "Performance: This will most likely cause an N+1, so we might want to preload it (in the resolver)."
  • https://gitlab.com/gitlab-org/gitlab/-/blob/remote_dev/ee/app/graphql/types/remote_development/workspace_type.rb#L22-22

  • field :user, ::Types::UserType,
      null: false, description: 'Owner of the workspace.'

• !105783 (comment 1374844224)
  • "Performance: I'm not 100% sure but this also might cause an N+1."
  • https://gitlab.com/gitlab-org/gitlab/-/blob/remote_dev/ee/app/graphql/types/remote_development/workspace_type.rb#L14-14

  • field :cluster_agent, ::Types::Clusters::AgentType,
      null: false,
      method: :agent,
      description: 'Kubernetes Agent associated with the workspace.'

• !105783 (comment 1374939446)
  • "Performance: We need an N+1 spec in this file"
  • https://gitlab.com/gitlab-org/gitlab/-/blob/remote_dev/ee/spec/requests/api/graphql/remote_development/workspaces_by_ids_spec.rb#L5-5

  • RSpec.describe 'Query.workspaces(ids: [RemoteDevelopmentWorkspaceID!])', feature_category: :remote_development do

References

• https://docs.gitlab.com/ee/development/api_graphql_styleguide.html#look-ahead