Update deployment.user properly when a manual job is played by a different user

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Summary

Currently, deployment.user is set when a pipeline job is created, and it's not updated even if the job is played by a different user than the original pipeline executor. This causes a minor problem on the data integrity that has an inconsistency at database level.

This is a follow-up of the workaround we recently shipped at https://gitlab.com/gitlab-org/gitlab-ce/issues/66037.

Proposal

Update deployment.user properly when the manual job is played/retried/etc by a different user.