Remove double-checked internal id generation.
What does this MR do?
This reverts the double-checking we introduced during a transition phase. See https://gitlab.com/gitlab-org/gitlab-ce/issues/45389 for details.
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Tests added for this feature/bug - Conform by the code review guidelines
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Has been reviewed by a Backend maintainer -
Has been reviewed by a Database specialist
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Conform by the merge request performance guides -
Conform by the style guides -
If you have multiple commits, please combine them into a few logically organized commits by squashing them -
End-to-end tests pass ( package-and-qamanual pipeline job)
What are the relevant issue numbers?
Edited by Yorick Peterse