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
✅ ACTION	actionlint	6		0	0	0.44s
✅ MARKDOWN	markdownlint	7	0	0	0	1.0s
✅ MARKDOWN	markdown-link-check	7		0	0	13.14s
✅ PYTHON	ruff	892	0	0	0	0.61s
✅ PYTHON	ruff-format	892	0	0	0	0.31s
✅ YAML	prettier	13	0	0	0	0.99s
✅ YAML	v8r	13		0	0	6.59s
✅ YAML	yamllint	13		0	0	0.55s

See detailed report in MegaLinter reports

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 56.25000% with 14 lines in your changes missing coverage. Please review.

Project coverage is 81.05%. Comparing base (02d14d0) to head (aed70a9).

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/messagebroker_kombu.py	0.00%	1 Missing ⚠️
newrelic/hooks/mlmodel_langchain.py	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1354      +/-   ##
==========================================
- Coverage   81.07%   81.05%   -0.02%     
==========================================
  Files         204      204              
  Lines       22832    22816      -16     
  Branches     3618     3620       +2     
==========================================
- Hits        18510    18493      -17     
+ Misses       3122     3120       -2     
- Partials     1200     1203       +3     

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