2.x: Final set of missing Completable marbles (+26)

[akarnokd]

This PR contains the final set of missing Completable marbles (#5789):

repeat

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repeatUntil

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repeatWhen

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retry

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retryWhen

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startWith

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timeout

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create

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unsafeCreate

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lift

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subscribe

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subscribeWith

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test

[codecov]

Codecov Report

Merging #6101 into 2.x will decrease coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##               2.x    #6101      +/-   ##
===========================================
- Coverage     98.3%   98.29%   -0.02%     
  Complexity    6197     6197              
===========================================
  Files          667      667              
  Lines        44862    44862              
  Branches      6213     6213              
===========================================
- Hits         44100    44095       -5     
- Misses         228      230       +2     
- Partials       534      537       +3

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/io/reactivex/Completable.java	100% <ø> (ø)	117 <0> (ø)	⬇️
...nternal/operators/parallel/ParallelReduceFull.java	91.08% <0%> (-3.97%)	2% <0%> (ø)
...l/operators/observable/ObservableFlatMapMaybe.java	93.46% <0%> (-2.62%)	2% <0%> (ø)
...rnal/operators/flowable/FlowableSkipLastTimed.java	95.91% <0%> (-2.05%)	2% <0%> (ø)
...nternal/operators/observable/ObservableWindow.java	98% <0%> (-2%)	3% <0%> (ø)
.../io/reactivex/disposables/CompositeDisposable.java	98.14% <0%> (-1.86%)	39% <0%> (-1%)
...java/io/reactivex/processors/PublishProcessor.java	98.19% <0%> (-1.81%)	42% <0%> (-1%)
...ernal/operators/flowable/FlowableFlatMapMaybe.java	94.2% <0%> (-0.97%)	2% <0%> (ø)
...operators/observable/ObservableMergeWithMaybe.java	99.1% <0%> (-0.9%)	2% <0%> (ø)
...ernal/operators/flowable/FlowableTimeoutTimed.java	98.37% <0%> (-0.82%)	3% <0%> (ø)
... and 15 more

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