2.x: More Observable marbles, 01/10-a

[akarnokd]

More marbles for Observable:

• retry(int)
• retry(BiFunction)
• retry(Predicate)
• retry(int, Predicate)
• retryUntil(BooleanSupplier)
• share
• switchMapSingle
• switchMapSingleDelayError

Images in #5319 (comment) .

[codecov]

Codecov Report

Merging #5804 into 2.x will increase coverage by 0.04%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                2.x    #5804      +/-   ##
============================================
+ Coverage     96.32%   96.36%   +0.04%     
+ Complexity     5821     5816       -5     
============================================
  Files           634      634              
  Lines         41647    41647              
  Branches       5776     5776              
============================================
+ Hits          40115    40133      +18     
+ Misses          601      583      -18     
  Partials        931      931

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/io/reactivex/Observable.java	100% <ø> (ø)	509 <0> (ø)	⬇️
.../operators/completable/CompletableConcatArray.java	93.75% <0%> (-6.25%)	2% <0%> (ø)
.../operators/observable/ObservableFlatMapSingle.java	88.8% <0%> (-5.98%)	2% <0%> (ø)
...tivex/internal/schedulers/InstantPeriodicTask.java	61.11% <0%> (-5.56%)	7% <0%> (-2%)
.../io/reactivex/internal/functions/ObjectHelper.java	94.73% <0%> (-5.27%)	20% <0%> (-1%)
.../internal/operators/flowable/FlowableInterval.java	94.44% <0%> (-2.78%)	3% <0%> (ø)
...l/operators/observable/ObservableFlatMapMaybe.java	94.11% <0%> (-2.62%)	2% <0%> (ø)
...tivex/internal/schedulers/TrampolineScheduler.java	92.3% <0%> (-2.57%)	6% <0%> (ø)
...a/io/reactivex/internal/queue/MpscLinkedQueue.java	98.03% <0%> (-1.97%)	17% <0%> (-1%)
.../io/reactivex/disposables/CompositeDisposable.java	97.24% <0%> (-1.84%)	39% <0%> (-1%)
... and 30 more

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