Adds UnderlinePanels to drafts/ (#4550)

* adds UnderlinePanels components and stories

stylistic tweaks

more stylistic tweaks

* adds tests, minor stylistic updates

* adds component docs

* adds changeset

* corrects changeset

* fixes circ dep, tests, misc bugs

* more test fixes

* appease the linter

* updates snaps, fixes tiny visual regression

* test(vrt): update snapshots

* cleanup

* upgrades @github/tab-container-element

* fixes createComponent import

* updates jest snapshots

* Apply suggestion from @broccolinisoup

Co-authored-by: Armağan <[email protected]>

* addresses PR feedback

* fix broken import

* addresses more PR feedback

* test(vrt): update snapshots

* test(vrt): update snapshots

* adds fallbacks to CSS vars

* fixes CSS typo

* fixes more typos

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Co-authored-by: mperrotti <[email protected]>
Co-authored-by: Armağan <[email protected]>

Author: mperrotti