Improve user experience for VCS metadata generator menu button to mitigate accidentally overriding

[Cass-dev-web]

Simply added a check to see if Git is already initialized, and if so, it would change the user interface to display Override Version Control Metadata... instead of Create Version Control Metadata... to avoid confusion (just a polish, low priority).

Please review the code and provide feedback as I am new to push requests.

[Cass-dev-web]

Commit 6416791: Added a wacky hack which checks that the class name does not conflict with Editor as it would cause #88601 to happen.

Needs work & needs to be tested for non-node extending scripts.

P.S.: I'm unsure if this needs to be a separate pull request, and if that's possible with one already pending approval

[Cass-dev-web]

Updated

[dalexeev]

This works, but the text is updated only after restarting the editor. This can be solved by checking the file on the EditorFileSystem.filesystem_changed signal or every time the popup is shown. In my opinion, this is an overkill, replacing "Create" with "Create/Override" or "Setup" will work too.

Also, please squash commits into one. To do this you need a local git client, GitHub web interface doesn't support it.

[Cass-dev-web]

That's a better way of doing it, seems like it was a bit too ambitious in terms of performance, although it did lead to me learning new things, so this entire PR wasn't in vain :)

[Cass-dev-web]

Also, please squash commits into one.

Squashed.

[dalexeev]

Looks good to me. Please squash commits one more time (note that you can do this locally before force-push to save CI resources).

[Cass-dev-web]

Squashed (not sure if I did it the right way however 🤔 )

[akien-mga]

You squashed it correctly, but adding "(squashed x2)" in the commit message was unnecessary. Once merged, it shouldn't matter to a reader whether that commit is the result of squashing multiple earlier commits or not, what matters is what the commit does :)

If you can amend the commit with git commit --amend to remove that part, it should be perfect. But if not it's not a big deal, we can also merge as is.

[akien-mga]

Thanks!