Remove redundant methods from Sample(Observable)

[lxsmnsyc]

Resolves: #6468

[codecov]

Codecov Report

Merging #6469 into 2.x will increase coverage by 0.03%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##                2.x    #6469      +/-   ##
============================================
+ Coverage     98.26%   98.29%   +0.03%     
+ Complexity     6295     6291       -4     
============================================
  Files           675      675              
  Lines         45173    45159      -14     
  Branches       6246     6244       -2     
============================================
+ Hits          44388    44390       +2     
+ Misses          247      240       -7     
+ Partials        538      529       -9

Impacted Files	Coverage Δ	Complexity Δ
...al/operators/flowable/FlowableSamplePublisher.java	100% <100%> (ø)	3 <0> (ø)	⬇️
...ors/observable/ObservableSampleWithObservable.java	98.68% <100%> (-0.12%)	3 <0> (ø)
.../operators/flowable/FlowableBlockingSubscribe.java	93.02% <0%> (-4.66%)	10% <0%> (-1%)
...nternal/operators/parallel/ParallelReduceFull.java	91.08% <0%> (-3.97%)	2% <0%> (ø)
...activex/internal/observers/QueueDrainObserver.java	97.43% <0%> (-2.57%)	21% <0%> (-1%)
...ernal/operators/flowable/FlowableFlatMapMaybe.java	93.23% <0%> (-2.42%)	2% <0%> (ø)
...activex/internal/schedulers/ScheduledRunnable.java	98.07% <0%> (-1.93%)	29% <0%> (-1%)
...internal/operators/flowable/FlowableSwitchMap.java	95.28% <0%> (-1.42%)	3% <0%> (ø)
...a/io/reactivex/internal/util/QueueDrainHelper.java	98.61% <0%> (-1.39%)	57% <0%> (-1%)
...java/io/reactivex/processors/UnicastProcessor.java	98.8% <0%> (-1.2%)	67% <0%> (-1%)
... and 22 more

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[akarnokd]

Could you also check Flowable.sample(Flowable)?

[lxsmnsyc]

Could you also check Flowable.sample(Flowable)?

I'll check into it

[lxsmnsyc]

done with the Flowable.sample