Fix Copy to Clipboard for SSH Public Key on Pull Repository settings

What does this MR do?

Fixes a bug where Copy to clipboard button doesn't work if SSH public key is not present initially and generated for first time by changing authentication type to SSH.

Why was this MR needed?

This MR fixes a regression.

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 #3167 (closed)