Refactor is_project_func method for Windows compatibility

[DraKen0009]

The previous implementation of the is_project_func method had issues related to path handling on Windows systems, potentially leading to incorrect identification of project code.

Changes made:

• Utilized os.path.normpath() for path normalization.
• Modified file path comparison to correctly identify project code.
• Implemented exclusion of 'site-packages' and 'dist-packages' directories.

Fixes: #1836

[tim-schilling]

@DraKen0009 do you have a test that confirms that this fixes the problem on windows? I doubt we'll run it in CI, but it'll make me feel better if there were a test along with this.

[DraKen0009]

@tim-schilling , I haven't created test , but I can create a simple unit test for it, can you guide me where in project directory do I need to create it ?

[tim-schilling]

It probably belongs in the test file for the profile panel. If you look at the tests directory, there should be a panels directory with files for each of the panels.

[matthiask]

I'm a bit saddened by the move from Path objects to os.path. Isn't there a way to achieve the same thing using pathlib?

[tim-schilling]

@DraKen0009 is there any option to continue using pathlib?

[matthiask]

Tests pass and the implementation is strictly superior to the current one. I have removed the pathlib flake8 rules from my own projects since it's annoying and using pathlib isn't always better.

Thanks!