Performance Improvements to Vue MR page

What does this MR do?

It improves the performance by using v-show instead of v-if and it replaces the BS4 tab system with its own switching (cause BS4 is reflowing all the time).

Are there points in the code the reviewer needs to double check?

Check the performance

Why was this MR needed?

🚀

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests added for this feature/bug
• Conform by the code review guidelines
  • Has been reviewed by a UX Designer
  • Has been reviewed by a Frontend maintainer
  • Has been reviewed by a Backend maintainer
  • Has been reviewed by a Database specialist
• Conform by the merge request performance guides
• Conform by the style guides
• If you have multiple commits, please combine them into a few logically organized commits by squashing them
• Internationalization required/considered
• End-to-end tests pass (package-and-qa manual pipeline job)

What are the relevant issue numbers?

Closes #48492 (closed)