fix: Implement feedback from alpha testers - part 2

[BoppLi]

We received some feedback from our alpha testers / developers:

Other feedback is in

• fix: implement feedback from alpha testers #1267
• Implement feedback from alpha testers - part 3 (essential for beta) #1266
• Implement feedback from alpha testers - part 4 (nice to have) #1498

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• OnyxSelect: Discuss if modelValue prop should only be the actual value instead of the whole option
  • Implement OnyxSelect API refactoring #1397
• Form validation: Custom error should always be displayed, not only on when the user interacted with the component. Maybe also let the developer decide whether the errors show instantly or only after interaction
  • Implement override option to show error on :invalid instead of :user-invalid #1375

Implemented by @JoCa96

• OnyxInput/OnyxTextarea: Label tooltip icon not aligned vertically
• OnyxButton: Width changes when set to loading, should keep the same width to prevent layout shifts

Feedback from 18th June

• OnyxButton: Discuss if links should be supported natively
  • Implement OnyxButton link variation #1427

Implemented by @BoppLi

• OnyxSelect: Update description of listLabel prop to be more meaningful, e.g. "Label describing the list of options to support assistive technologies Example: label: "animal" list-label: "List of animals""