2.x: Single.subscribe(BiConsumer) consistent isDisposed

[akarnokd]

Fixes the Single.subscribe(BiConsumer) to report isDisposed when terminating.

Reported in #5276.

[codecov]

Codecov Report

Merging #5277 into 2.x will increase coverage by 0.08%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##                2.x    #5277      +/-   ##
============================================
+ Coverage     96.02%   96.11%   +0.08%     
- Complexity     5752     5754       +2     
============================================
  Files           628      628              
  Lines         41077    41079       +2     
  Branches       5699     5699              
============================================
+ Hits          39445    39482      +37     
+ Misses          658      627      -31     
+ Partials        974      970       -4

Impacted Files	Coverage Δ	Complexity Δ
...x/internal/observers/BiConsumerSingleObserver.java	100% <100%> (ø)	7 <2> (ø)	⬇️
...nternal/operators/observable/ObservableCreate.java	91.96% <0%> (-7.15%)	2% <0%> (ø)
.../operators/completable/CompletableConcatArray.java	93.75% <0%> (-6.25%)	2% <0%> (ø)
...reactivex/internal/operators/maybe/MaybeUsing.java	95.95% <0%> (-4.05%)	4% <0%> (ø)
...nternal/operators/parallel/ParallelSortedJoin.java	91.3% <0%> (-3.63%)	2% <0%> (ø)
...al/operators/observable/ObservableSampleTimed.java	93.33% <0%> (-3.34%)	3% <0%> (ø)
...rnal/operators/flowable/FlowableFlatMapSingle.java	93.4% <0%> (-2.75%)	2% <0%> (ø)
...rnal/operators/flowable/FlowableSequenceEqual.java	96.34% <0%> (-2.44%)	2% <0%> (ø)
.../internal/operators/maybe/MaybeTakeUntilMaybe.java	97.95% <0%> (-2.05%)	2% <0%> (ø)
...activex/internal/disposables/DisposableHelper.java	98.14% <0%> (-1.86%)	27% <0%> (-1%)
... and 38 more

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