Fix some problems with pathlib PosixPath/WindowsPath behavior

[camillobruni]

Describe the changes

Adding tests to document subtle pyfakefs differences described in issue 1053

Tasks

• Unit tests added that reproduce the issue or prove feature is working
• Fix or feature added
• Entry to release notes added
• Pre-commit CI shows no errors
• Unit tests passing
• For documentation changes: The Read the Docs preview builds and looks as expected

[mrbean-bremen]

@camillobruni - I have added a commit that shall fix most of the issues, but I still got one failing test (test_real_file_with_home) under Posix and Python < 3.12, which I have disabled at the moment.
Can you please check how this version works for you?

[kurtmckee]

I haven't read all of this but wanted to offer feedback for what I did see.

[mrbean-bremen]

I haven't read all of this but wanted to offer feedback for what I did see.

Another pair of eyes is always helpful, especially as I rarely get reviews here. Given enough eyeballs...

[camillobruni]

Late reply back from vacation: thanks a lot for these fixes!

[mrbean-bremen]

@camillobruni - I added a workaround to get the failing test running, and I would merge this if you give your ok. Did you have a chance to test it?
Oh, and I forgot the release notes, will add these before merging, of course.

[camillobruni]

Cool, double checked locally and I got the tests working with this 👍

[ossieoj3]

great work guys