[3.x] Replace some ObjecsHelpers methods with Java 8 APIs

[JakeWharton]

No description provided.

[JakeWharton]

These are all desugared as of AGP 3.5.

[codecov]

Codecov Report

Merging #6770 into 3.x will decrease coverage by 0.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##                3.x    #6770      +/-   ##
============================================
- Coverage     98.23%   98.22%   -0.02%     
+ Complexity     6205     6192      -13     
============================================
  Files           681      681              
  Lines         44783    44779       -4     
  Branches       6164     6164              
============================================
- Hits          43994    43985       -9     
- Misses          275      278       +3     
- Partials        514      516       +2

Impacted Files	Coverage Δ	Complexity Δ
...xjava3/internal/operators/single/SingleEquals.java	93.93% <100%> (ø)	2 <0> (ø)	⬇️
...xjava3/internal/operators/maybe/MaybeContains.java	100% <100%> (ø)	3 <0> (ø)	⬇️
...java3/internal/schedulers/TrampolineScheduler.java	98.7% <100%> (ø)	6 <0> (ø)	⬇️
...eactivex/rxjava3/internal/functions/Functions.java	99.15% <100%> (ø)	37 <0> (ø)	⬇️
...tivex/rxjava3/internal/functions/ObjectHelper.java	100% <100%> (ø)	9 <0> (-12)	⬇️
...io/reactivex/rxjava3/schedulers/TestScheduler.java	100% <100%> (ø)	11 <0> (ø)	⬇️
...in/java/io/reactivex/rxjava3/schedulers/Timed.java	100% <100%> (ø)	13 <0> (ø)	⬇️
.../reactivex/rxjava3/observers/BaseTestConsumer.java	97.23% <100%> (ø)	69 <0> (ø)	⬇️
...ctivex/rxjava3/internal/util/NotificationLite.java	100% <100%> (ø)	30 <0> (ø)	⬇️
...n/java/io/reactivex/rxjava3/core/Notification.java	93.93% <100%> (ø)	22 <0> (ø)	⬇️
... and 15 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 2392349...31e245a. Read the comment docs.