Fix aria labels on custom notifications modal

What does this MR do?

• Fix aria-labelledby attribute on tags in the Custom Notifications modal

Why was this MR needed?

• Hamlit doesn't support parsing aria like it does for the data attribute (except for the label property??)

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
  • 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 #32094 (closed)