PEP 829 needs to be handled for editable install paths

[rchiodo]

https://peps.python.org/pep-0829/

This pep changes how pth files work and introduces a new concept for .start files for dynamic code. I believe our editable install detection looks for pth files, so I believe we need to update it to also look for .start files too.

[github-actions]

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Similar Issues (FYI only, not solutions)

The following issues may or may not be related to your report. They are provided for reference only, as they may describe similar symptoms, affect the same feature, or address related concerns, but may not be the same issue.

• Go to definition not working for packages installed using editable installs with import-hook .pth files – go to definition not working #5732

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