3.x: Fix Schedulers.from to honor interruptibleWorker across methods

[akarnokd]

The direct scheduling methods of the ExecutorScheduler created via Schedulers.from(Executor, boolean) did not fully honor the interruptibleWorker settings.

Fixes #7201

[codecov]

Codecov Report

Merging #7203 (e9af0e6) into 3.x (a4e087d) will decrease coverage by 0.03%.
The diff coverage is 100.00%.

@@ Coverage Diff @@ ## 3.x #7203 +/- ## ============================================ - Coverage 99.54% 99.51% -0.04%  Complexity 6757 6757 ============================================ Files 747 747 Lines 47387 47392 +5 Branches 6384 6382 -2 ============================================ - Hits 47170 47160 -10  - Misses 99 106 +7  - Partials 118 126 +8 

Impacted Files	Coverage Δ	Complexity Δ
...xjava3/internal/schedulers/AbstractDirectTask.java	100.00% <100.00%> (ø)	21.00 <3.00> (ø)
...rxjava3/internal/schedulers/ExecutorScheduler.java	100.00% <100.00%> (ø)	10.00 <0.00> (ø)
...x/rxjava3/internal/schedulers/NewThreadWorker.java	94.91% <100.00%> (ø)	19.00 <2.00> (ø)
...ternal/schedulers/ScheduledDirectPeriodicTask.java	100.00% <100.00%> (ø)	2.00 <1.00> (ø)
...java3/internal/schedulers/ScheduledDirectTask.java	100.00% <100.00%> (ø)	2.00 <1.00> (ø)
...x/rxjava3/internal/schedulers/SingleScheduler.java	97.59% <100.00%> (ø)	15.00 <2.00> (ø)
...tivex/rxjava3/internal/jdk8/ParallelCollector.java	93.57% <0.00%> (-2.76%)	2.00% <0.00%> (ø%)
.../operators/observable/ObservableFlatMapSingle.java	94.44% <0.00%> (-2.39%)	2.00% <0.00%> (ø%)
...ernal/operators/flowable/FlowableFlatMapMaybe.java	95.85% <0.00%> (-2.08%)	2.00% <0.00%> (ø%)
...reactivex/rxjava3/processors/PublishProcessor.java	98.16% <0.00%> (-1.84%)	41.00% <0.00%> (-1.00%)
... and 11 more

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