Resolve symlinks in locker.lock path to real physical paths

[spoorn]

Fixes #5849

Pull Request Check List

Resolves: #5849

• [ x ] Added tests for changed code.
• Updated documentation for changed code.

[spoorn]

Having some trouble getting the new test to pass on Windows.

Windows Python < 3.8 does not resolve symlinks at all using os.path.realpath(): https://docs.python.org/3/library/os.path.html#os.path.realpath

The suggestion is instead to use os.readlink(), but that does not give the correct path for Python >= 3.8 as it resolves to the substitute path which contains a prefix \\\\?\\, instead of the display path, due to https://bugs.python.org/issue42957

Few options we can take:

1. Use pathlib.Path().resolve(): 8.0.2 doesn't validate paths correctly pallets/click#2088 (comment). Supposedly this has a little more overhead, but poetry uses pathlib everywhere already and the consistently amongst versions is more maintainable
2. Use os.readlink() and remove prefix "\\?\"
3. Check for python version. If < 3.8, use os.readlink(), else use os.path.realpath()
4. Disable the test for Python < 3.8, so only Windows 3.7 will not resolve symlinks

Will try out option 1

Edit: Option 1 passes the checks

[spoorn]

Could I get a review for this?

[radoering]

Just some minor nitpicks in the test.

[github-actions]

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