allow reordering dashboard tabs (#30833)

* allow reordering dashboard tabs

* remove comment

* remove unused prop

* remove react import

* Update frontend/src/metabase/core/components/TabRow/TabRow.styled.tsx

Co-authored-by: Ryan Laurie <30528226+iethree@users.noreply.github.com>

* rename utils.ts to test-utils.ts

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Co-authored-by: Ryan Laurie <30528226+iethree@users.noreply.github.com>