fix: add index.scss to npm files

[joshblack]

This adds in the index.scss file to packages that specify files. This is currently breaking re-exports from packages using Sass modules.

Changelog

New

Changed

• Add index.scss to files array in package.json files

Removed

Testing / Reviewing

• Verify all packages that have an index.scss and use a files array include index.scss in that files array

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