test(unit): add useTabs tests and refactor the hook

Michael Holstrequested to merge
m.holst/k3k-web-frontend:unit-tests/2565_useTabs into main

closes #2565

Refactored the useTabs-hook because it was rendering 3 times in case of all the useEffect and state handlings, which are not needed.

Edited by Michael Holst

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