Fix Stylelint configuration

[basil]

While investigating the failures in #10158, I realized we were using the wrong Stylelint configuration: that for plain CSS rather than SCSS. Switching from stylelint-config-standard to the more appropriate stylelint-config-standard-scss allowed us to remove several workarounds in .stylelintrc and several media-query-no-invalid ignores, as well as resolving the errors in #10158. Of course, this also turned up a few new violations, but they were all trivial to fix. A number of SCSS rules required adding or removing whitespace or parentheses, or replacing deprecated global methods with newer fine-grained modules.

Testing done

mvn clean verify

Proposed changelog entries

N/A

Proposed upgrade guidelines

N/A

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1. The Jira issue, if it exists, is well-described.
2. The changelog entries and upgrade guidelines are appropriate for the audience affected by the change (users or developers, depending on the change) and are in the imperative mood (see examples). Fill in the Proposed upgrade guidelines section only if there are breaking changes or changes that may require extra steps from users during upgrade.
3. There is automated testing or an explanation as to why this change has no tests.
4. New public classes, fields, and methods are annotated with @Restricted or have @since TODO Javadocs, as appropriate.
5. New deprecations are annotated with @Deprecated(since = "TODO") or @Deprecated(forRemoval = true, since = "TODO"), if applicable.
6. New or substantially changed JavaScript is not defined inline and does not call eval to ease future introduction of Content Security Policy (CSP) directives (see documentation).
7. For dependency updates, there are links to external changelogs and, if possible, full differentials.
8. For new APIs and extension points, there is a link to at least one consumer.

Desired reviewers

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3. Changelog entries in the pull request title and/or Proposed changelog entries are accurate, human-readable, and in the imperative mood.
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5. If the change needs additional upgrade steps from users, the upgrade-guide-needed label is set and there is a Proposed upgrade guidelines section in the pull request title (see example).
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[krisstern]

LGTM

[janfaracik]

That's great, LGTM!

[basil]

De minimis; expediting to unblock #10168.