feat(jest-config): add support for loading scss files

[joshblack]

Add support for importing sass files from Jest. This is helpful for visibility checks in JSDOM that are based on CSS.

Changelog

New

Changed

• Update our CSS transformer to compile and insert the require'd CSS into the document head
• Update our transform options to apply to scss or css

Removed

Testing / Reviewing

• Verify stylesheet is loaded in the accordion test

[jnm2377]

Hmm. Looks like some theme tests are failing.

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[joshblack]

@jnm2377 just pushed up a fix 👀