4.x: Detect un-awaited CompletionStageDisposables during tests

[akarnokd]

Adds a tracking mechanism to track CompositeStageDisposables which are never await() 'd or ignore()'d or close()'d.

Mainly test time verification.

The trouble is that if they escape the executorservice scope, it can interrupt the unit test unexpectedly and result in failed tests due to operator bugs.

The error stacktrace will point at the test and where the CSD was allocated in the code.

[github-actions]

🐷 TruffleHog + Entropy Beauty Scan

Average entropy of changed code: 4.601 bits/char
Verdict: ✅ Mid-4 beauty detected (thoughtful human code!)

Changed files entropy:

src/main/java/io/reactivex/rxjava4/core/CompletionStageDisposable.java: 4.818
src/main/java/io/reactivex/rxjava4/core/Flowable.java: 4.779
src/main/java/io/reactivex/rxjava4/core/Scheduler.java: 4.547
src/main/java/io/reactivex/rxjava4/core/Streamable.java: 4.517
src/main/java/io/reactivex/rxjava4/core/Streamer.java: 4.517
src/main/java/io/reactivex/rxjava4/core/VirtualEmitter.java: 4.833
src/main/java/io/reactivex/rxjava4/core/VirtualTransformer.java: 4.852
src/main/java/io/reactivex/rxjava4/disposables/CompositeDisposable.java: 4.279
src/main/java/io/reactivex/rxjava4/disposables/DisposableContainer.java: 4.437
src/main/java/io/reactivex/rxjava4/functions/Consumer3.java: 4.910
src/main/java/io/reactivex/rxjava4/internal/disposables/ListCompositeDisposable.java: 4.072
src/main/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableEmpty.java: 4.851
src/main/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableFromPublisher.java: 4.459
src/main/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableJust.java: 4.494
src/main/java/io/reactivex/rxjava4/internal/schedulers/SchedulerToExecutorService.java: 4.461
src/main/java/io/reactivex/rxjava4/internal/virtual/FlowableVirtualCreateExecutor.java: 4.452
src/main/java/io/reactivex/rxjava4/internal/virtual/FlowableVirtualTransformExecutor.java: 4.140
src/test/java/io/reactivex/rxjava4/completable/CompletableIsolatedTest.java: 4.785
src/test/java/io/reactivex/rxjava4/completable/CompletableTest.java: 4.435
src/test/java/io/reactivex/rxjava4/internal/operators/flowable/FlowableReplayEagerTruncateTest.java: 4.665

✅ No secrets or suspicious high-entropy strings found.

Mid-4 beauty heuristic in action — powered by our entropy chats! 😊

[github-actions]

🐷 TruffleHog + Entropy Beauty Scan

Average entropy of changed code: 4.601 bits/char
Verdict: ✅ Mid-4 beauty detected (thoughtful human code!)

Changed files entropy:

src/main/java/io/reactivex/rxjava4/core/CompletionStageDisposable.java: 4.818
src/main/java/io/reactivex/rxjava4/core/Flowable.java: 4.779
src/main/java/io/reactivex/rxjava4/core/Scheduler.java: 4.547
src/main/java/io/reactivex/rxjava4/core/Streamable.java: 4.517
src/main/java/io/reactivex/rxjava4/core/Streamer.java: 4.517
src/main/java/io/reactivex/rxjava4/core/VirtualEmitter.java: 4.833
src/main/java/io/reactivex/rxjava4/core/VirtualTransformer.java: 4.852
src/main/java/io/reactivex/rxjava4/disposables/CompositeDisposable.java: 4.279
src/main/java/io/reactivex/rxjava4/disposables/DisposableContainer.java: 4.437
src/main/java/io/reactivex/rxjava4/functions/Consumer3.java: 4.910
src/main/java/io/reactivex/rxjava4/internal/disposables/ListCompositeDisposable.java: 4.072
src/main/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableEmpty.java: 4.851
src/main/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableFromPublisher.java: 4.459
src/main/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableJust.java: 4.494
src/main/java/io/reactivex/rxjava4/internal/schedulers/SchedulerToExecutorService.java: 4.461
src/main/java/io/reactivex/rxjava4/internal/virtual/FlowableVirtualCreateExecutor.java: 4.452
src/main/java/io/reactivex/rxjava4/internal/virtual/FlowableVirtualTransformExecutor.java: 4.140
src/test/java/io/reactivex/rxjava4/completable/CompletableIsolatedTest.java: 4.785
src/test/java/io/reactivex/rxjava4/completable/CompletableTest.java: 4.435
src/test/java/io/reactivex/rxjava4/internal/operators/flowable/FlowableReplayEagerTruncateTest.java: 4.665

✅ No secrets or suspicious high-entropy strings found.

Mid-4 beauty heuristic in action — powered by our entropy chats! 😊

[codecov]

Codecov Report

❌ Patch coverage is 73.33333% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 98.90%. Comparing base (73241eb) to head (aedc4b3).
⚠️ Report is 1 commits behind head on 4.x.

Files with missing lines	Patch %	Lines
...ctivex/rxjava4/core/CompletionStageDisposable.java	73.33%	6 Missing and 2 partials ⚠️

❌ Your patch status has failed because the patch coverage (73.33%) is below the target coverage (95.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff              @@
##                4.x    #8093      +/-   ##
============================================
- Coverage     98.94%   98.90%   -0.05%     
- Complexity     6863     6867       +4     
============================================
  Files           767      767              
  Lines         48557    48586      +29     
  Branches       6506     6508       +2     
============================================
+ Hits          48047    48052       +5     
- Misses          388      397       +9     
- Partials        122      137      +15     

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