2.x: fix time bounded replaySubject getValue() inconsistency with getValues() on old items

[nathankooij]

See #5433.

[akarnokd]

LGTM. The build may need several restart as currently it either times out or gets killed by the container for some reason.

[codecov]

Codecov Report

Merging #5434 into 2.x will increase coverage by 0.05%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##                2.x    #5434      +/-   ##
============================================
+ Coverage     96.02%   96.07%   +0.05%     
- Complexity     5787     5801      +14     
============================================
  Files           631      631              
  Lines         41291    41297       +6     
  Branches       5742     5744       +2     
============================================
+ Hits          39648    39678      +30     
+ Misses          650      634      -16     
+ Partials        993      985       -8

Impacted Files	Coverage Δ	Complexity Δ
.../java/io/reactivex/processors/ReplayProcessor.java	98.76% <100%> (ø)	49 <0> (ø)	⬇️
...main/java/io/reactivex/subjects/ReplaySubject.java	96.47% <100%> (+0.02%)	50 <0> (ø)	⬇️
...ternal/operators/flowable/FlowableSubscribeOn.java	91.52% <0%> (-6.78%)	2% <0%> (ø)
...vex/internal/operators/single/SingleTakeUntil.java	86.88% <0%> (-6.56%)	2% <0%> (ø)
...ernal/operators/flowable/FlowableFromIterable.java	88.77% <0%> (-5.35%)	5% <0%> (ø)
...ternal/operators/observable/ObservablePublish.java	91.22% <0%> (-4.39%)	9% <0%> (-1%)
.../internal/operators/maybe/MaybeTakeUntilMaybe.java	93.87% <0%> (-4.09%)	2% <0%> (ø)
...ex/internal/operators/maybe/MaybeTimeoutMaybe.java	95.58% <0%> (-2.95%)	2% <0%> (ø)
...nternal/operators/parallel/ParallelSortedJoin.java	92.75% <0%> (-2.18%)	2% <0%> (ø)
...rnal/operators/flowable/FlowableFlatMapSingle.java	95.1% <0%> (-2.18%)	2% <0%> (ø)
... and 36 more

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