feat(steps/tabs): remove prop destroyOnHide

[mlmoravek]

Related to #1133

Proposed Changes

• Remove prop destroyOnHide for Steps and Tabs component
  • By moving the template with the v-if one layer deeper (in fix(performance): solve performance issues with child component registration #1133), I realised that the destroyOnHide option only hides the slot, so we can remove this option and anyone can hide the slot contents themselves. Therefore I added an active property to the slot, so anyone can implement this themselves.

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