Fix exclusive rules selection for only arg

[dhruvmanila]

Summary

Earlier, if a user had define a rule selection or exclusion using the lint.args setting, it would collide with the only parameter. The purpose of the only parameter is to only run Ruff for the given rule excluding everything else. The "excluding everything else" part was done with --extend-ignore=ALL. The problem, as highlighted in the linked issue, was that if there's a user defined --ignore / --select (or their --extend-* version), then the ALL directive won't work because:

When breaking ties between enabled and disabled rules (via select and ignore, respectively), more specific prefixes override less specific prefixes.

Reference: https://docs.astral.sh/ruff/settings/#ignore

This means that between --select=E,F and --ignore=ALL, the former wins.

This PR fixes this issue by checking for the following argument pattern in user defined settings, skipping them if the only parameter is given:

• ["--select", "A,B,C"] / ["--select=A,B,C"]
• ["--ignore", "A,B,C"] / ["--ignore=A,B,C"]

And their --extend-* version.

Test Plan

Manual testing locally :)

fixes: astral-sh/ruff-vscode#328

[dhruvmanila]

Current dependencies on/for this PR:

• main
  • PR Fix exclusive rules selection for only arg #310 👈

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