Fix TopSky-Incorrect-Push workflow

[Liaely]

Partially fixes #1478

Summary of changes

Amends the TopSky-Incorrect-Push workflow to correctly validate and test. It now will be able to fail.

Screenshots

Note: There has since been minor changes to wording, but not to the logic elements since the screenshot was made.

Screenshots taken in a private testing repository.

Failure example:

Success example:

Additional information

AI (GitHub Copilot) was used to assist in making these changes (primarily for my own experimentation regarding it 🤔 ); I have tested them and understand them as if I had done them myself.

[Liaely]

#1478 (comment)

@Liaely can we make it easier to work out what we should/n't edit in the UK/Data/Plugin/TopSky_* folders too? @mid-archie and I originally made changes in one of the TopSkyCPDLC.txt files before it was pointed out that this was now a shared file. But neither GitHub nor the file itself made reference to this. Can we maybe put a big comment at the top of all the auto-generated files that says "DON'T EDIT THIS"?

@hazzas-99 I think this should fix it! I've cherry-picked the commit whilst I work on the compiler itself proper so that it can be put into practice quicker.
(The whole point of the workflow is to scream at you if you edit the wrong shared files)