Show fork suggestion when user cannot perform in add-to-tree dropdown

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Proposal

@alyssatrinh directory page actions I also noticed that when users who don't have permission to modify a directory try to add a New file / Upload file / New directory, no messaging or alert is shown before the fork is created for users. This can be quite jarring, as users may go from trying to add something to a directory, to a fork being created (and potentially taking a long time) without any input or confirmation. We don't provide users a way to opt out of creating a fork from the directory pages. A modal may help in this situation as well.

Directory page: fork is created automatically	File page: users are shown message before forking
directory-newfile.mov	fork_suggestion_before.mov

I would suggest going with a modal instead of an alert for the directory and file page actions that would prompt a user to fork a repo:

• Directory page
  • New file
  • Upload file
  • New directory
• File page
  • Replace file
  • Delete
  • Edit

I also suggest simplifying the text so that we can use the same modal on the directory and file page:

• Fork to make changes
• You're not allowed to make changes to this project directly. Create a fork to make changes and submit a merge request.
• Cancel Fork

Scope

Include ForkSuggestionModal for the actions in AddToTree that result in forking the project before completing the action.