[hotfix] [s3] Minor fixes/code simplifications in S3 recoverable writer

flink-filesystems/flink-s3-fs-base/src/main/java/org/apache/flink/fs/s3/common/utils/BackPressuringExecutor.java

@@ -23,7 +23,6 @@
 import org.apache.flink.util.FlinkRuntimeException;
 
 import java.util.concurrent.Executor;
-import java.util.concurrent.RejectedExecutionException;
 import java.util.concurrent.Semaphore;
 import java.util.concurrent.atomic.AtomicBoolean;
 
@@ -66,11 +65,9 @@ public void execute(Runnable command) {
 		final SemaphoreReleasingRunnable runnable = new SemaphoreReleasingRunnable(command, permits);
 		try {
 			delegate.execute(runnable);
-		} catch (RejectedExecutionException e) {
+		} catch (Throwable e) {
 			runnable.release();
 			ExceptionUtils.rethrow(e, e.getMessage());
-		} catch (Throwable t) {
-			ExceptionUtils.rethrow(t, t.getMessage());
 		}
 	}