Implement WaWi Input onyx replacement

[JoCa96]

Why?

As a WaWi UI/UX TL, I want to see how complex the switch to onyx is going to be, so that I can start the migration efforts.

As part of our commitment to support the WaWi migration to onyx, we will now replace the WuxInput component with the OnyxInput component.

Depends on

• Define onyx integration into WaWi [Spike] #675

Acceptance criteria

• The WuxInput internally uses OnyxInput
• There is no major visual discrepancy
  • If there are, they are approved by the WaWi designers
• All features are supported by onyx or follow-up tickets have been created:
  • Implement WaWi input replacement follow-up #2308

Definition of Done

• A working branch contains the changes