Fix file.exclude for complex extensions

[kutyel]

Fixes #56812

@isidorn I think it is pretty straight forward 😉 Although the new test is having a timeout don't know exactly why 😕 should be easy to fix though!

[msftclas]

All CLA requirements met.

[isidorn]

No, this fix does not really fix it. The extname has an expected behavior which you just changed
For more details check out the node docs https://nodejs.org/api/path.html#path_path_extname_path

[kutyel]

@isidorn you are right, hope you like it better now 🙂 would you please help me to figure out why the test does not work? I managed to debug locally and it works but the test does not finish 😕

[isidorn]

This is changing the functionality of glob which can affect many other things. So again this fix is not good imho.
Though forwarding to @bpasero since he owns the glob.

Unfortunetly I do not have time right now to look into why the test is failing.

[bpasero]

Closing for the reasons mentioned. I think we would need to introduce a new syntax for this to not break backwards compatibility.