3.x: Fix replay() not resetting when the connection is disposed

[akarnokd]

Disposing a replay()-based connectable should reset the operator to its fresh state. This was supposed to happen but the relevant code changes were not enabled. The PR fixes this for both Flowable and Observable-based implementations.

The publish-based connectables work as intended.

Fixes #6920

[codecov]

Codecov Report

Merging #6921 into 3.x will decrease coverage by 0.00%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                3.x    #6921      +/-   ##
============================================
- Coverage     99.65%   99.65%   -0.01%     
+ Complexity     6670     6669       -1     
============================================
  Files           742      742              
  Lines         47217    47220       +3     
  Branches       6367     6367              
============================================
  Hits          47055    47055              
- Misses           48       50       +2     
- Partials        114      115       +1     

Impacted Files	Coverage Δ	Complexity Δ
...tivex/rxjava3/internal/jdk8/ParallelCollector.java	93.57% <0.00%> (-4.59%)	2.00% <0.00%> (ø%)
.../operators/observable/ObservableFlatMapSingle.java	94.44% <0.00%> (-2.39%)	2.00% <0.00%> (ø%)
...rnal/operators/flowable/FlowableFlatMapSingle.java	95.34% <0.00%> (-2.33%)	2.00% <0.00%> (ø%)
...ernal/operators/flowable/FlowableFlatMapMaybe.java	95.85% <0.00%> (-2.08%)	2.00% <0.00%> (ø%)
...ternal/operators/completable/CompletableMerge.java	97.29% <0.00%> (-1.36%)	2.00% <0.00%> (ø%)
...a3/internal/operators/flowable/FlowableReplay.java	98.92% <0.00%> (-1.08%)	21.00% <0.00%> (-1.00%)
...perators/observable/ObservableMergeWithSingle.java	99.05% <0.00%> (-0.95%)	2.00% <0.00%> (ø%)
...ternal/operators/observable/ObservableFlatMap.java	98.17% <0.00%> (ø)	3.00% <0.00%> (ø%)	⬆️
...3/internal/operators/flowable/FlowableGroupBy.java	99.68% <0.00%> (+0.31%)	3.00% <0.00%> (ø%)	⬆️
...operators/flowable/FlowableConcatMapScheduler.java	99.60% <0.00%> (+0.39%)	4.00% <0.00%> (ø%)	⬆️
... and 7 more

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