[Eui] Revert theme switching and Borealis theme#201262

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tsullivan wants to merge 2 commits intoelastic:mainfrom tsullivan:eui-provider-regression-test

+343-750

Commits on Nov 21, 2024

Revert "[Visual Refresh] Add Borealis theme (elastic#199993 )"
tsullivan
committed
Revert "Add basic support for experimental theme switching (elastic#199748 )"
tsullivan
committed