dslx: post-Func.Apply(Maybe[T])-introduction cleanups #1384
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This diff contains cleanups in dslx after we modified Func.Apply to take a Maybe[T] as input:
we don't need anymore to record the failed operation because we can compute that inline, given that now we can write post-operation filters that observe whether the operation failed or succeeded;
likewise, we don't need to use counters anymore;
likewise, we can remove functions to inspect the first error, because we can compute that inline.
The reference issue is ooni/probe#2613.