Show teachers their plan constraints in the assignment creation screen

[BenEmdon]

Feature request ✨

This was initially implemented in #924
And reverted in #944

[stale]

This issue has been automatically marked as stale because it has not had recent activity. Thank you for your contributions.

[BenEmdon]

@d12 we should try achieve this as part of the work being done with assignment setup. This should be a small piece of work.

[d12]

🙌 Adding to the project board!

[spinecone]

I've been poking around the original PR, the revert, and slack discussion around them, and it looks like what happened was:

• Private repos #924 was deployed which started causing some kind of error
• Fix method call #943 was created because 924 was using an incorrect method name (private_repos_available? rather than has_private_repos_available?)
• 943 didn't deploy correctly for some reason (the heaven log has already been pruned so I can't see what the error was 😭 ) so we just reverted the whole PR with Revert "Private repos" #944

Does that sound accurate? If so I might attempt what 943 was originally trying to do and just fix the method name, and see if that works 🤞 .