Fix: no-unused-vars false positive (fixes #7250)

[mysticatea]

What is the purpose of this pull request? (put an "X" next to item)

[ ] Documentation update
[x] Bug fix (template)
[ ] New rule (template)
[ ] Changes an existing rule (template)
[ ] Add autofixing to a rule
[ ] Add a CLI option
[ ] Add something to the core
[ ] Other, please explain:

See #7250 for template.

Please check each item to ensure your pull request is ready:

• I've read the pull request guide
• I've included tests for my change
• I've updated documentation for my change (if appropriate)

What changes did you make? (Give an overview)

I had changed the after-used option's behavior in #7143 in order to fix the false negative that the rule overlooks unused variables if the last parameter is ignored by argsIgnorePattern.

Now, the rule has false positive that it warns the last non-ignored parameter even if the last (ignored) parameter is used.
This PR fixes the false positive.

semver-patch: A bug fix in a rule that results in ESLint reporting fewer errors.

Is there anything you'd like reviewers to focus on?

• Is this fix needed?

[eslintbot]

LGTM

[mention-bot]

@mysticatea, thanks for your PR! By analyzing the annotation information on this pull request, we identified @vitorbal, @wavebeem and @nzakas to be potential reviewers

[platinumazure]

I'm 👍 for this fix- the intent of argsIgnorePattern (as I see it) is to suppress warnings for commonly ignored variables when they are unused. But if the variable is used, it should still get credit as being used.

Thanks for writing this up, @mysticatea!

[platinumazure]

LGTM, thanks!

[nzakas]

LGTM, just want the release folks to do the merging just in case.