Throttle calls to await.delay() in some diagnostics

These 5 diagnostics cause ~70% of all calls to await.delay() by
diagnostics which in turn is about ~20% of the total runtime of
diagnostics.

Out of these diagnostics only assign-type-mismatch commonly exceeds
runtimes of 100ms (worst observed in my dataset was 7 seconds) and
even then it still attempts to call await.delay() over 1500 times
per second, so throttling by a factor of 15 is still fine.

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