3.x: Remove vararg overloads for combineLatest in Observable + Flowable

[vanniktech]

Started removing the vararg function from #6634

[vanniktech]

Hmm after looking at the tests the varag variant for combineLatestDelayError might be useful since there are no 2-x overloads available. What do you think?

[akarnokd]

Let me guess, IntelliJ refactor?

[akarnokd]

The varargs is a convenience over the array variant so combineLatestDelayErrors can go.

[codecov]

Codecov Report

Merging #6635 into 3.x will decrease coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##                3.x    #6635      +/-   ##
============================================
- Coverage     98.16%   98.16%   -0.01%     
  Complexity     6182     6182              
============================================
  Files           678      678              
  Lines         44801    44795       -6     
  Branches       6177     6177              
============================================
- Hits          43981    43974       -7     
- Misses          278      281       +3     
+ Partials        542      540       -2

Impacted Files	Coverage Δ	Complexity Δ
.../main/java/io/reactivex/rxjava3/core/Flowable.java	100% <100%> (ø)	562 <0> (-3)	⬇️
...ain/java/io/reactivex/rxjava3/core/Observable.java	100% <100%> (ø)	538 <0> (-2)	⬇️
...l/operators/observable/ObservableFlatMapMaybe.java	88.88% <0%> (-5.56%)	2% <0%> (ø)
...eactivex/rxjava3/processors/BehaviorProcessor.java	96.58% <0%> (-2.44%)	51% <0%> (ø)
.../internal/disposables/ListCompositeDisposable.java	98% <0%> (-2%)	34% <0%> (-1%)
...tivex/rxjava3/disposables/CompositeDisposable.java	98.14% <0%> (-1.86%)	39% <0%> (-1%)
...ernal/operators/flowable/FlowableFromIterable.java	96.79% <0%> (-1.07%)	5% <0%> (ø)
.../operators/observable/ObservableFlatMapSingle.java	88.28% <0%> (-0.79%)	2% <0%> (ø)
...nternal/operators/parallel/ParallelSortedJoin.java	94.89% <0%> (-0.73%)	2% <0%> (ø)
.../operators/observable/ObservableCombineLatest.java	96.31% <0%> (-0.62%)	6% <0%> (ø)
... and 18 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 97790c6...d56dc2e. Read the comment docs.