Fix error in resource_events tables while deleting user
What does this MR do?
While investigating why user is not deleted while destroying an account, I discovered bug in Sentry - in resource events tables (4 of them) we are setting that user_id cannot be NULL, but in foreign key we are setting ON DELETE NULLIFY. This is causing an error.
Instead I added switching to ghost user id while deleting user.
Screenshots
https://sentry.gitlab.net/gitlab/gitlabcom/issues/1635101/?query=is%3Aunresolved%20DeleteUserWorker
Does this MR meet the acceptance criteria?
Conformity
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Availability and Testing
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Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process. -
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Informed Infrastructure department of a default or new setting change, if applicable per definition of done
Security
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The MR includes necessary changes to maintain consistency between UI, API, email, or other methods -
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