fix: detect nginx upgrade

[nickchen]

Proposed changes

In proc, if the process symlink path has (deleted), it's an indication that the process was deleted. Since we already have binary change detection, this change deletes the "deleted" in the exec path, and trim out the "deleted" so the exec path is valid for the original binary, which could have an updated binary.

Checklist

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• I have read the CONTRIBUTING document
• If applicable, I have added tests that prove my fix is effective or that my feature works
• If applicable, I have checked that any relevant tests pass after adding my changes
• I have updated any relevant documentation (README.md)

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[yluf5]

I have tested the NAP upgrade case with this change and verified that it works.

[dhurley]

Could you add a unit test for this?
Also could you run make deps as well?

[nickchen]

Could you add a unit test for this? Also could you run make deps as well?

done, added tests for sanitize function, did not expand the scope since it looks like require other setups.