Remove monitor in TyrusSession

[jbescos]

With JFR it is possible to detect the event jdk.VirtualThreadPinned:

	java.lang.VirtualThread#parkOnCarrierThread(675)
	java.lang.VirtualThread#park(593)
	java.lang.System$2#parkVirtualThread(2643)
	jdk.internal.misc.VirtualThreads#park(54)
	java.util.concurrent.locks.LockSupport#park(219)
	java.util.concurrent.locks.AbstractQueuedSynchronizer#acquire(754)
	java.util.concurrent.locks.AbstractQueuedSynchronizer#acquire(990)
	java.util.concurrent.locks.ReentrantLock$Sync#lock(153)
	java.util.concurrent.locks.ReentrantLock#lock(322)
	java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue#offer(1100)
	java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue#add(1127)
	java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue#add(899)
	java.util.concurrent.ScheduledThreadPoolExecutor#delayedExecute(342)
	java.util.concurrent.ScheduledThreadPoolExecutor#schedule(562)
	org.glassfish.tyrus.core.TyrusSession#restartIdleTimeoutExecutor(519)
	org.glassfish.tyrus.core.TyrusEndpointWrapper#onMessage(860)
	org.glassfish.tyrus.core.TyrusWebSocket#onMessage(196)
	org.glassfish.tyrus.core.frame.TextFrame#respond(116)
	org.glassfish.tyrus.core.ProtocolHandler#process(826)
	org.glassfish.tyrus.core.TyrusWebSocketEngine$TyrusReadHandler#handle(552)
	io.helidon.microprofile.tyrus.TyrusConnection$TyrusListener#writeToTyrus(210)
	io.helidon.microprofile.tyrus.TyrusConnection$TyrusListener#onMessage(169)
	io.helidon.microprofile.tyrus.TyrusConnection#handle(81)
	io.helidon.webserver.http1.Http1Connection#handle(185)
	io.helidon.webserver.ConnectionHandler#run(165)
	io.helidon.common.task.InterruptableTask#call(47)
	io.helidon.webserver.ThreadPerTaskExecutor$ThreadBoundFuture#run(239)
	java.lang.Thread#runWith(1596)
	java.lang.VirtualThread#run(309)
	java.lang.VirtualThread$VThreadContinuation$1#run(190)
	jdk.internal.vm.Continuation#enter0(320)
	jdk.internal.vm.Continuation#enter(312)
	jdk.internal.vm.Continuation#enterSpecial(-1)