Notify user they won't have privileges to create branch when creating new project

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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

#27566 (closed) #25093 (closed) #7583 (closed) #30202 (closed)