bootstrap: split NodeMainInstance::Run() and move handle checking code to the snapshot builder #39007
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bootstrap: split NodeMainInstance::Run()
Split the running of the instance so that it can be reused
by the snapshot builder when we need to run the loop for
user code.
bootstrap: move event loop handle checking into snapshot builder
This is only necessary for the snapshot builder (because we
have no way to resurrect the handles at the moment). In addition,
print the handles if the debug flag is set or if the queues
are not empty after snapshot is created.
Refs: #35711
Refs: #38905