Add retries to job heartbeat

[awdavidson]

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Add retries to Job.heartbeat to avoid job SIGTERM due to intermittent/transient database issues. Raised in #37378

[boring-cyborg]

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[potiuk]

I think you should split the retries - separately for fetch and separately for update

[potiuk]

I would love to have some more reviews on that one - to see if no-one can see a side effect (I believe it is safe to retry on the level of those methods.

[potiuk]

Anyone :) ?

[boring-cyborg]

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