TabBar - use slots instead of arrays in the Tabbar

[thrbnhrtmnn]

Description / User Story

The TabBar should use slots instead of arrays, similar to ButtonGroup or FormCaptionGroup.

One possible and the currently preferred way to do this would also be to introduce a new Tab component, which like the Radio is just a part of the parent Group component and would never be user as a standalone component. In design we already have a Tab component on the page of the TabBar (also exactly like the Radio on the RadioGroup page).

---

Acceptance Criteria

• The TabBar uses slots instead of an array
• Props Excel has been updated / comments have been resolved and props changed from red to black font color > ask @angelicahoyss or @thrbnhrtmnn for support here

---

Background information

• This task blocks Storybook Documentation - Component: TabBar #420 + another task to document the Tab component in case we create one