Revert "fix: handle ForkJoinPool scheduling behavior in ExecutorScheduler"

This reverts commit 61732f3.

Author: halotukozak

monix-execution/jvm/src/main/scala/monix/execution/schedulers/ExecutorScheduler.scala

@@ -100,13 +100,6 @@ object ExecutorScheduler {
     // Implementations will inherit BatchingScheduler, so this is guaranteed
     val ft = features + Scheduler.BATCHING
     service match {
-      case _: ForkJoinPool =>
-        // ForkJoinPool implements ScheduledExecutorService since JDK 25,
-        // but its scheduling behavior differs from ScheduledThreadPoolExecutor
-        // (e.g. exception handling in scheduled tasks). Use the simple executor
-        // path with Monix's own ScheduledExecutorService for reliable scheduling.
-        val s = Defaults.scheduledExecutor
-        new FromSimpleExecutor(s, service, reporter, executionModel, ft)
       case ref: ScheduledExecutorService =>
         new FromScheduledExecutor(ref, reporter, executionModel, ft)
       case _ =>