Restore flake8 test

[Gsantomaggio]

This PR restores the flake8 linting test in the CI workflow and fixes various linting issues that were identified by flake8.

• Uncommented the flake8 test in the GitHub Actions workflow
• Cleaned up unused variables and imports across test files
• Fixed incorrect string encoding in AMQP message bodies

[Copilot]

Pull Request Overview

This PR restores the flake8 linting test in the CI workflow and fixes various linting issues that were identified by flake8.

• Uncommented the flake8 test in the GitHub Actions workflow
• Cleaned up unused variables and imports across test files
• Fixed incorrect string encoding in AMQP message bodies

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
.github/workflows/test.yaml	Restored flake8 linting step and updated RabbitMQ image version
tests/test_consumer.py	Removed unused variable declarations and fixed string encoding issues
tests/test_producer.py	Removed unused variable declaration
tests/test_amqp.py	Removed unused pytest_asyncio import
tests/conftest.py	Removed unused pytest import and added super stream cleanup

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[Copilot]

Catching bare Exception is too broad and can hide unexpected errors. Consider catching more specific exceptions or at least logging the exception for debugging purposes.

Suggested change

	except Exception:
	# it doesn't matter if it fails
	pass
	except Exception as e:
	# it doesn't matter if it fails, but log for debugging
	logging.warning(f"Failed to delete super stream 'test-super-stream': {e}")