Only add original author tag line when importing from GitHub if there isn't a linked GitLab account
What does this MR do?
If there we've found a linked GitLab user for a creator of an issue or comment don't add the 'Created By:' line.
Why was this MR needed?
Requested in #21569 (closed)
Does this MR meet the acceptance criteria?
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CHANGELOG entry added - Tests
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Added for this feature/bug -
All builds are passing
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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 #21569 (closed)