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Refs #19908

Refs #19908

Enable new rules:
* no-empty-pattern
* no-magic-numbers (exempting 0 and ±1)

Refs #19908

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Refs #19908

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️️️ https://github.com/twbs/bootstrap/graphs/contributors

Use concat's process function instead.

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Also switch to `^`.

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Also remove the workaround for the old validator version.

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Remove csscomb (soon replace it with something else) because scsslint has most of it covered already

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Adapt uglify for the new version.

Closes #18068

Fixes #18224.

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