Enable pyflakes

[TimPansino]

Overview

• Enable pyflakes linter in ruff.
• Fix all pyflakes violations.
• Correct issues found in openai, kombu, and psycopg2 instrumentation (noticed due to linter violations).

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ MARKDOWN	markdownlint	7	0	0	0	1.1s
✅ MARKDOWN	markdown-link-check	7		0	0	11.68s
✅ PYTHON	ruff	905	0	0	0	0.85s
✅ PYTHON	ruff-format	905	0	0	0	0.28s
✅ YAML	prettier	13	0	0	0	1.16s
✅ YAML	v8r	13		0	0	6.69s
✅ YAML	yamllint	13		0	0	0.58s

See detailed report in MegaLinter reports

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 59.37500% with 13 lines in your changes missing coverage. Please review.

Project coverage is 81.55%. Comparing base (612c671) to head (5573629).

Files with missing lines	Patch %	Lines
newrelic/hooks/database_psycopg2.py	0.00%	2 Missing and 2 partials ⚠️
newrelic/hooks/external_botocore.py	20.00%	4 Missing ⚠️
newrelic/api/out_function.py	0.00%	1 Missing ⚠️
newrelic/core/agent_control_health.py	0.00%	1 Missing ⚠️
newrelic/hooks/database_aiomysql.py	0.00%	1 Missing ⚠️
newrelic/hooks/framework_graphql.py	0.00%	1 Missing ⚠️
newrelic/hooks/mlmodel_langchain.py	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1354      +/-   ##
==========================================
+ Coverage   81.05%   81.55%   +0.49%     
==========================================
  Files         205      205              
  Lines       23216    23200      -16     
  Branches     3669     3671       +2     
==========================================
+ Hits        18817    18920     +103     
+ Misses       3186     3054     -132     
- Partials     1213     1226      +13     

☔ 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.

[hmstepanek]

It's surprising to me that this has been wrong for so long but I don't actually see in the existing code where it is gated by this check higher up so this seems correct to me.