generalize the idea of a "unique internal user"
What does this MR do?
Generalizes the implementation of !7393 (merged) for re-use with other unique internal users besides the ghost user.
Are there points in the code the reviewer needs to double check?
Why was this MR needed?
We will need other such users in the future, such as the EE ServiceDesk support bot.
Screenshots (if relevant)
Does this MR meet the acceptance criteria?
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Documentation created/updated - Tests
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All builds are passing
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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