Create a new session on closing of another can create deadlock

"grpc-default-worker-ELG-1-1" #57 daemon prio=5 os_prio=0 cpu=25024.63ms elapsed=2828.70s tid=0x00007fc0e6a9d010 nid=0x533f waiting on condition  [0x00007fc0e69f8000]
   java.lang.Thread.State: TIMED_WAITING (parking)
	at jdk.internal.misc.Unsafe.park(java.base@17.0.3-vanilla/Native Method)
	- parking to wait for  <0x00000000c36ea3d0> (a java.util.concurrent.CompletableFuture$Signaller)
	at java.util.concurrent.locks.LockSupport.parkNanos(java.base@17.0.3-vanilla/LockSupport.java:252)
	at java.util.concurrent.CompletableFuture$Signaller.block(java.base@17.0.3-vanilla/CompletableFuture.java:1866)
	at java.util.concurrent.ForkJoinPool.unmanagedBlock(java.base@17.0.3-vanilla/ForkJoinPool.java:3463)
	at java.util.concurrent.ForkJoinPool.managedBlock(java.base@17.0.3-vanilla/ForkJoinPool.java:3434)
	at java.util.concurrent.CompletableFuture.timedGet(java.base@17.0.3-vanilla/CompletableFuture.java:1939)
	at java.util.concurrent.CompletableFuture.get(java.base@17.0.3-vanilla/CompletableFuture.java:2095)
	at tech.ydb.core.impl.pool.GrpcChannel$ReadyWatcher.getReadyChannel(GrpcChannel.java:80)
	at tech.ydb.core.impl.pool.GrpcChannel.getReadyChannel(GrpcChannel.java:46)
	at tech.ydb.core.impl.BaseGrpcTransport.unaryCall(BaseGrpcTransport.java:84)
	at tech.ydb.table.rpc.grpc.GrpcTableRpc.createSession(GrpcTableRpc.java:50)
	at tech.ydb.table.impl.BaseSession.createSessionId(BaseSession.java:174)
	at tech.ydb.table.impl.pool.SessionPool$Handler.create(SessionPool.java:183)
	at tech.ydb.table.impl.pool.WaitingQueue.tryToCreateNewPending(WaitingQueue.java:226)
	at tech.ydb.table.impl.pool.WaitingQueue.checkNextWaitingAcquire(WaitingQueue.java:276)
	at tech.ydb.table.impl.pool.WaitingQueue.lambda$checkNextWaitingAcquire$0(WaitingQueue.java:279)
	at tech.ydb.table.impl.pool.WaitingQueue$$Lambda$2581/0x00000008013e9000.accept(Unknown Source)
	at java.util.concurrent.CompletableFuture.uniWhenComplete(java.base@17.0.3-vanilla/CompletableFuture.java:863)
	at java.util.concurrent.CompletableFuture.uniWhenCompleteStage(java.base@17.0.3-vanilla/CompletableFuture.java:887)
	at java.util.concurrent.CompletableFuture.whenComplete(java.base@17.0.3-vanilla/CompletableFuture.java:2325)
	at tech.ydb.table.impl.pool.WaitingQueue.checkNextWaitingAcquire(WaitingQueue.java:277)
	at tech.ydb.table.impl.pool.WaitingQueue.lambda$checkNextWaitingAcquire$0(WaitingQueue.java:279)
	at tech.ydb.table.impl.pool.WaitingQueue$$Lambda$2581/0x00000008013e9000.accept(Unknown Source)

Start by tracing session creation and waiting behavior through tech.ydb.table.impl.pool.SessionPool, WaitingQueue, BaseSession, and tech.ydb.core.impl.pool.GrpcChannel, using the supplied stack trace as the entry point. Reproduce or isolate the case where creating a session while another closes causes a deadlock, then verify that session-pool operations complete without blocking each other.