Fix Issues Related to Path.parent with no Parent Directory

[TimPansino]

Overview

• Fix instances of calling pathlib.Path.parent on a command line path, that may have no parent directory listed.
  • In these cases, this should search the PATH to find an executable of this name. Instead, the current change is interpreting no parent as ./, producing incorrect results.
  • Fix this by reverting to os.path.dirname for this specific use case, and ignore PTH linter.

Testing

• Tested locally with newrelic-admin run-program flask run and newrelic-admin run-python main.py.
• Can't find a decent way to test the sys.argv[0] being an executable with no path, but there's probably not a lot of risk. The comments indicate this is generally a Heroku only thing as well.

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ ACTION	actionlint	6		0	0	0.68s
✅ MARKDOWN	markdownlint	7	0	0	0	1.21s
✅ MARKDOWN	markdown-link-check	7		0	0	25.14s
✅ PYTHON	ruff	922	0	0	0	0.83s
✅ PYTHON	ruff-format	922	0	0	0	0.36s
✅ YAML	prettier	13	0	0	0	1.34s
✅ YAML	v8r	13		0	0	6.0s
✅ YAML	yamllint	13		0	0	0.63s

See detailed report in MegaLinter reports

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.34%. Comparing base (ac38993) to head (6d4818d).
⚠️ Report is 273 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1434      +/-   ##
==========================================
- Coverage   81.37%   81.34%   -0.03%     
==========================================
  Files         208      208              
  Lines       23563    23563              
  Branches     3716     3716              
==========================================
- Hits        19174    19168       -6     
- Misses       3132     3137       +5     
- Partials     1257     1258       +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.