Overlapping path check too strict

[spoorcc]

Fixes #684

Description by Korbit AI

What change is being made?

Relax the overlapping path check in the dfetch update command to ignore scenarios where a real path matches exactly with a destination or does not have any actual parent/child overlapping paths, and add relevant tests to ensure proper functionality.

Why are these changes being made?

The previous implementation erroneously flagged exact path matches as overlaps due to a strict common prefix logic, causing unnecessary warnings and process skips during updates. The new approach accurately identifies true overlapping paths by leveraging Path parent relationships and ensures only genuine overlaps are warned against, thus resolving issue #684 efficiently.

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[korbit-ai]

I've completed my review and didn't find any issues... but I did find this frog.

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Files scanned

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File Path	Reviewed
dfetch/commands/update.py	✅

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