Fix rule-selector-property-disallowed-list false positives for nesting selectors

[romainmenke]

Which issue, if any, is this issue related to?

Closes #7488

Is there anything in the PR that needs further explanation?

I noticed that this walks down the entire sub tree for each rule node.
This might not be what users expect.

But changing it to .each() also has issues.
It will no longer give errors on :

.bad-selector {
  @media screen {
    color: red;
  }
}

Edit: I've found a more complete patch

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Latest commit: 1c6b2a0

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[ybiquitous]

@romainmenke Thank you for the pull request! This is just an idea, but how about resolving and flattening selectors like #7518?

[ybiquitous]

resolving and flattening selectors

Umm... I realized that this way is problematic, as #7557 describes.

[romainmenke]

Thank you for the review @ybiquitous 🙇

[ybiquitous]

Thank you! LGTM 👍🏼