quota: show an error if project does not exist yet
- Temporary fix until upstream harbor robot account permissions are fixed
- Checks if the project exists, displays a (slightly) more informative error message if not
Bug: T353701
How to register an account on GitLab. To prevent spam, new accounts are locked until approved by an admin or the approver bot. You can also file an unlock request to expedite access.
Support: mw:GitLab, how to host a project on GitLab, #wikimedia-gitlab on libera.chat, #GitLab on Phabricator.
Bug: T353701