2.x: add/update Observable marbles (07/30)

[akarnokd]

This PR updates the marbles of the following Observable operators:

• just (image) by @leonardortlima
• rangeLong (image) by @leonardortlima
• startWith (image) by @leonardortlima
• startWithArray (image) by @leonardortlima
• sorted (image) by @leonardortlima

See #5319.

[codecov]

Codecov Report

Merging #5524 into 2.x will increase coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                2.x    #5524      +/-   ##
============================================
+ Coverage     96.11%   96.12%   +0.01%     
  Complexity     5804     5804              
============================================
  Files           631      631              
  Lines         41285    41285              
  Branches       5732     5732              
============================================
+ Hits          39680    39686       +6     
+ Misses          636      627       -9     
- Partials        969      972       +3

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/io/reactivex/Observable.java	100% <ø> (ø)	506 <0> (ø)	⬇️
...vex/internal/operators/single/SingleTakeUntil.java	86.88% <0%> (-4.92%)	2% <0%> (ø)
...erators/completable/CompletableConcatIterable.java	95.91% <0%> (-4.09%)	2% <0%> (ø)
...io/reactivex/internal/util/BackpressureHelper.java	95.91% <0%> (-4.09%)	21% <0%> (-1%)
...reactivex/internal/operators/maybe/MaybeUsing.java	95.95% <0%> (-4.05%)	4% <0%> (ø)
...rnal/operators/completable/CompletableTimeout.java	94% <0%> (-4%)	2% <0%> (ø)
...nternal/operators/observable/ObservableCreate.java	94.01% <0%> (-3.42%)	2% <0%> (ø)
...ternal/operators/completable/CompletableCache.java	96.96% <0%> (-3.04%)	23% <0%> (-1%)
.../operators/observable/ObservableFlatMapSingle.java	88.8% <0%> (-2.99%)	2% <0%> (ø)
...activex/internal/operators/single/SingleCache.java	97.05% <0%> (-2.95%)	23% <0%> (-1%)
... and 36 more

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