Assign job token when scheduling the job

What does this MR do and why?

Related to #349877 and &7290 (comment 1153949169)

This should speed up the pipeline creation service because it removes the assignment of job tokens from the service and delays it until the job is executed. This should also slow the growth of the tokens index because we don't assign tokens for jobs that will not be executed(i.e. skipped ones).

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