Resolve ""Edit" labels in the issuable sidebar are not consistent"

What does this MR do?

This makes the 'Edit' links in the issuable sidebar consistent.

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

No need for the Sidebar| namespace for these generic links.

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• No need for a Changelog entry added, if necessary
• Review
  • Has been reviewed by Frontend
  • Has been reviewed by Backend
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together
• Internationalization required/considered

What are the relevant issue numbers?

Closes #42190 (closed)