Guarantee all vue data functions return an object

What does this MR do?

All vue data functions should return an object

'[Vue warn]: data functions should return an object:
https://vuejs.org/v2/guide/components.html#data-Must-Be-a-Function
(found in <Root>)'

Does this MR meet the acceptance criteria?

• Tests
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #32138 (moved)