This more appropriately blocks converging in the engine, since we are
now 1-1 decoupled from the Watch resource. This simplifies resource
writing, and should be more accurate around small converged timeouts.
We don't block in the Worker routine when we are polling, because we
expect to get constant poll events, and we can instead be more careful
about these by looking at CheckApply results.
If we can do this for all resources in the future, it would be
excellent!
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