Project: warning about remote repository

In #687 the project repo and remote repo fields were combined into a single multifield with a lot of interaction between the two fields.

There was an addition for the case where a user is interacting with a project that they don't have the remote repo relationship for. We want to show to these users that they are not the owner of the relationship to remote repo, and ultimate we want to warn the user that they do not have permissions to use the remote repo so that deselecting the remote repo is irreversible.

There are some changes that we can iterate on here next:

• The query for the select choice info label "This repository is connected through another user's account" might be wrong. I noticed on a test project that the remote repo warning was on the select, even though I should have the remote repo on my account. This might be a non-issue too. I was able to save the project and the UI was what I expected

• We probably want a warning UI about why the user should be careful. That is, that the change is irreversible.