3.x: Remove Maybe.onExceptionResumeNext

[akarnokd]

It was always very peculiar to let only checked exceptions resumed.

Resolves #6842

[codecov]

Codecov Report

Merging #6844 into 3.x will increase coverage by 0.03%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##                3.x    #6844      +/-   ##
============================================
+ Coverage     98.24%   98.28%   +0.03%     
+ Complexity     6381     6376       -5     
============================================
  Files           715      715              
  Lines         46529    46522       -7     
  Branches       6388     6387       -1     
============================================
+ Hits          45714    45723       +9     
+ Misses          292      285       -7     
+ Partials        523      514       -9

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/io/reactivex/rxjava3/core/Maybe.java	100% <100%> (ø)	178 <0> (-1)	⬇️
...va3/internal/operators/maybe/MaybeOnErrorNext.java	100% <100%> (ø)	2 <1> (ø)	⬇️
.../operators/flowable/FlowableBlockingSubscribe.java	93.02% <0%> (-4.66%)	10% <0%> (-1%)
...java3/internal/observers/FutureSingleObserver.java	94.33% <0%> (-3.78%)	24% <0%> (-1%)
...eactivex/rxjava3/processors/BehaviorProcessor.java	95.56% <0%> (-3.45%)	49% <0%> (-1%)
...nternal/operators/observable/ObservableWindow.java	98.18% <0%> (-1.82%)	3% <0%> (ø)
...rnal/operators/flowable/FlowableFlatMapSingle.java	94.18% <0%> (-1.17%)	2% <0%> (ø)
...operators/observable/ObservableMergeWithMaybe.java	99.09% <0%> (-0.91%)	2% <0%> (ø)
.../operators/observable/ObservableFlatMapSingle.java	89.68% <0%> (-0.8%)	2% <0%> (ø)
...ternal/operators/observable/ObservableGroupBy.java	95.08% <0%> (-0.55%)	2% <0%> (ø)
... and 16 more

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