Backport of job_endpoint: check spec for all regions into release/1.3.x #14545
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Backport
This PR is auto-generated from #14519 to be assessed for backporting due to the inclusion of the label backport/1.3.x.
The below text is copied from the body of the original PR.
This PR introduces a helper method to the Job RPC endpoint called specChanged. This method checks whether an incoming jobspec has changed relative to the currently deployed jobspec in all regions. This handles the case where a job has been stopped in one or more regions, and the operator now wants to restart it. By checking all regions, the spec change is detected, and a new job version can be computed and deployed to all multiregion targets.