chore: add inline noqa suppression

[johubertj]

Description of changes:

• s2n currently shows numerous linting warnings (F401 and F811) for code that is intentionally written this way (e.g., for test fixtures or managed processes). This PR adds inline # noqa directives to suppress these warnings

• Removed lgtm [py/unused-import] from multiple lines since noqa handles suppression (for both ruff and CodeQL)

Command to Auto-Generate Inline noqa

• Ran ruff check /home/ubuntu/s2n-tls/tests/integrationv2/{file_name} --add-noqa on multiple files to automatically append # noqa annotations where necessary.

Errors We're Suppressing & Justification

F811 (Redefinition) for managed_process – Pytest automatically injects fixtures, but Ruff incorrectly flags the manual import as a redefinition. Since the fixture is dynamically provided and not actually redefined, this warning is a false positive.

F401 (Unused Import) for managed_process – Ruff fails to recognize managed_process as used because it is passed as a function parameter. Since pytest fixtures are injected dynamically, the import is necessary, and the warning is incorrect.

F821 (Undefined) & F841 (Unused Variable) for input_view – input_view is only instantiated when stdin is registered after detecting send_marker, but since stdin isn’t initially registered, Ruff incorrectly assumes it is undefined or unused. The variable is always assigned before use.

[jmayclin]

I think this PR was entirely automated in generation? Can you include instructions about what commands were used to generate it?

Let's also include a description of all the errors that we are ignoring, and why it is safe/reasonable to do so.

[jmayclin]

Discussed offline about F821 & F841. I don't particularly love allowing these, but I'm not too concerned given that it's a specific exception and not a blanket exception.

Additionally, I would say that some funky variable ordering is one of the tricky parts of that IO function 😉