Add GitLab projects to repos endpoint

Add GitLab projects to repos endpoint, /api/v1/user/:userId/repos?type=admin

For review: Only need to review the Add GitLab projects to repos endpoint commit. The other commit is from https://gitlab.com/gitlab-org/gitter/webapp/-/merge_requests/1789

Part of https://gitlab.com/gitlab-org/gitter/webapp/issues/2411

This endpoint is used in the create community and create room flows for picking the repo to back the community/room

TODO

• Blocked by https://gitlab.com/gitlab-org/gitter/webapp/-/merge_requests/1789
• After https://gitlab.com/gitlab-org/gitter/webapp/-/merge_requests/1786/ merges, update gitter-web-identity stub in modules/permissions/test/policies/gl-project-policy-delegate-test.js to have GITLAB_IDENTITY_PROVIDER. You can see what we did for modules\permissions\test\policies\gl-group-policy-delegate-test.js