Ensure current user and variables are updated when playing a job

What does this MR do and why?

Related to #337063 (closed)

A customer mentioned that sometimes the job user is set inconsistently when a job is manually played.

In this MR we are ensuring that we update the job when it's manually played or raise an exception. The update should always occur and if it's not the case it could be caused by a bad input. See #337063 (comment 729782123)

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