Lint `Lib/test` with existing `ruff` configuration

[picnixz]

Feature or enhancement

Proposal:

There is an existing .ruff.toml file in Lib/test with some todo to fix.

Has this already been discussed elsewhere?

This is a minor feature, which does not need previous discussion elsewhere

Links to previous discussion of this feature:

No response

Linked PRs

• gh-132396: address redefinition of unused name errors in Lib/test #132397
• [3.13] gh-132396: Resolve 'redefinition of unused name' errors in Lib/test/ (GH-132397) #132699