feat(styles): add css folder to sideEffects

[joshblack]

Closes #11599

Add the css folder and files to sideEffects in package.json

Changelog

New

Changed

• The sideEffects field in package.json now includes the css folder

Removed

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[metonym]

I was thinking about this and I now wonder if scss/**/*.css is a typo?

greping for .css files in packages/styles/scss yields no results.

find ./packages/styles/scss |grep -e "\.css"

[joshblack]

@metonym I think it's in there to catch any "vendor" style CSS, originally I think we had flatpickr styles fall under there but we must have converted that file to .scss in the migration. In other words, since sass can import from scss or css it seemed important to capture both just in case.

Let me know if that makes sense!