Fix AfterTriggerSaveEvent to use a test and elog, not just Assert, to check
that it's called within an AfterTriggerBeginQuery/AfterTriggerEndQuery pair. The RI cascade triggers suppress that overhead on the assumption that they are always run non-deferred, so it's possible to violate the condition if someone mistakenly changes pg_trigger to mark such a trigger deferred. We don't really care about supporting that, but throwing an error instead of crashing seems desirable. Per report from Marcelo Costa.
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