Reset Queued allocs to zero when job stopped

[dadgar]

When a job is stopped but not purged, we should set the Queued count to
be zero.

[tantra35]

@dadgar Can this be as fix for problem when some jobs(3-4) with big allocations count(500 - 1200) stoped with nomad stop, and this operation can stuck nomad(nomad servers began eat too many memory, raft.db grows, and become unresponsive, but in usual case nomad operate normally), and we have problem described in #4477

[github-actions]

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