Fix accessibility issues for Input fields across GitLab

What does this MR do?

See the reported places with missing aria-label attributes in #31650 (closed)

Why was this MR needed?

This MR is part of continuous accessibility improvements in GitLab.

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• [ ] Documentation created/updated
• [ ] API support added
• Tests
  • [ ] Added for this feature/bug
  • 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 #31650 (closed)