Fix lightweight tags not processed correctly by GitTagPushService

What does this MR do?

Fix lightweight tags not processed correctly by GitTagPushService

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

No

Why was this MR needed?

Lightweight tags were being processed incorrectly, causing tag triggers to receive wrong information and not function properly.

Does this MR meet the acceptance criteria?

• CHANGELOG entry added
• 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 you do - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #22271 (closed)