fix: use-isnan doesn't report on SequenceExpressions

[StyleShit]

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

[ ] Documentation update
[X] Bug fix (template)
[ ] New rule (template)
[ ] Changes an existing rule (template)
[ ] Add autofix to a rule
[ ] Add a CLI option
[ ] Add something to the core
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What changes did you make? (Give an overview)

The use-isnan rule didn't report SequenceExpressions, so I've added a short condition to check for that, plus some tests

Closes #18058

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[nzakas]

@StyleShit can you please update your description and fill out the pull request template? This is required in every PR. Thanks!

[StyleShit]

@nzakas Sure, sorry for that (again... 😅)

I'm just used to opening a PR from my local machine without even opening Github, so it doesn't add the template.
Will make sure to use it next time 😄

[nzakas]

That's what I figured, no worries. :)

[nzakas]

Code LGTM. Can you also add some examples to the docs?

[StyleShit]

That's a good idea!
Not sure what/where to put it though, added this for now, but we can probably do better, WDYT?

[mdjermanovic]

LGTM, thanks! Leaving this open for @nzakas to verify.

[nzakas]

LGTM. Thanks!