2.x: Observable marble fixes 01/08-b

[akarnokd]

This PR adds and updates marbles of the following Observable operators:

• lastOrError
• onErrorReturn
• onErrorReturnItem
• onTerminateDetach
• publish(Function)
• reduce(seed, f)
• reduceWith
• repeat()
• repeat(long)
• repeatUntil
• replay()
• replay(int)
• replay(int, long, TimeUnit)
• replay(int, long, TimeUnit, Scheduler)
• replay(int, Scheduler)
• replay(long, TimeUnit)
• replay(long, TimeUnit, Scheduler)
• replay(Scheduler)

Images in #5319 (comment) .

[vanniktech]

I think there's a markdown error in your list.

[akarnokd]

Pressed some unexpected keyboard shortcut that created the PR prematurely. Updated.

[codecov]

Codecov Report

Merging #5797 into 2.x will increase coverage by 0.07%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                2.x    #5797      +/-   ##
============================================
+ Coverage     96.24%   96.31%   +0.07%     
- Complexity     5804     5811       +7     
============================================
  Files           634      634              
  Lines         41631    41631              
  Branches       5776     5776              
============================================
+ Hits          40066    40096      +30     
+ Misses          617      601      -16     
+ Partials        948      934      -14

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)
.../internal/operators/flowable/FlowableInterval.java	94.44% <0%> (-2.78%)	3% <0%> (ø)
...nternal/operators/observable/ObservableWindow.java	98% <0%> (-2%)	3% <0%> (ø)
...ex/internal/subscribers/InnerQueuedSubscriber.java	96.07% <0%> (-1.97%)	18% <0%> (-1%)
...ternal/operators/observable/ObservablePublish.java	92.98% <0%> (-1.76%)	11% <0%> (ø)
...perators/single/SingleFlatMapIterableFlowable.java	96.66% <0%> (-1.67%)	2% <0%> (ø)
...ivex/internal/operators/maybe/MaybeMergeArray.java	96.62% <0%> (-1.13%)	6% <0%> (ø)
...rnal/operators/flowable/FlowableFlatMapSingle.java	94.56% <0%> (-1.09%)	2% <0%> (ø)
...ava/io/reactivex/processors/BehaviorProcessor.java	94.17% <0%> (-0.9%)	59% <0%> (ø)
... and 32 more

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