Notify user they won't have privileges to create branch when creating new project
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=414545) </details> <!--IssueSummary end--> # Problem Depending on a developers access, they may be able to create a new project, but won't have enough permissions to create a branch. This leads to wasted time and general confusion for users. # Solution Since we've decided (see references) that we won't fix this, we should at least notify a user before they click 'create project' that they'll need to request someone with maintainership/ownership of the project namespace to create a branch for them. Bonus points if the tooltip/notification can tell the user who to contact. Maybe make the button gray or have some indication they can not create a main branch. ### References https://gitlab.com/gitlab-org/gitlab/-/issues/27566 https://gitlab.com/gitlab-org/gitlab/-/issues/25093 https://gitlab.com/gitlab-org/gitlab/-/issues/7583 https://gitlab.com/gitlab-org/gitlab/-/issues/30202
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