add evaluation watcher and enable atomic enqueues

[wdbaruni]

In many places we update the state of jobs or executions, create an evaluation, and then enqueue the evaluation to the broker. The creation and enqueue of evaluations is not atomic. This can result in a lot of edge cases and potentially dangling or stale jobs and executions due to failure to trigger their re-evaluation.

This PR fixes this by implementing a data store watcher the listens for created evaluations and auto-enqueue those evaluations to the broker.

What is left is backfill of non-terminal evaluations at startup which will be tracked by #3999

Closes #3972

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[frrist]

unused?

[wdbaruni]

removed in 5dba032