Syntax errors are silently ignored when consuming results with Result::getRowsUpdated

Try this example (I'm using reactor to work with the `Publisher`):

```java
System.out.println(
Flux.from(cf.create())
.flatMap(c -> c.createStatement(
"""
invalid sql
""")
.execute())
.flatMap(it -> it.getRowsUpdated())
.collectList()
.block()
);
```

This produces the following result:

```
[0]
```

When it should throw an error. It's different when I'm trying to consume results:

```java
System.out.println(
Flux.from(cf.create())
.flatMap(c -> c.createStatement(
"""
invalid sql
""")
.execute())
.flatMap(it -> it.map((r, m) -> r.get(0)))
.collectList()
.block()
);
```

Now I'm getting:

```
Exception in thread "main" com.google.cloud.spanner.SpannerException: INVALID_ARGUMENT: io.grpc.StatusRuntimeException: INVALID_ARGUMENT: Syntax error: Unexpected identifier "invalid" [at 1:1]
invalid sql
^ - Statement: 'invalid sql
'
at com.google.cloud.spanner.SpannerExceptionFactory.newSpannerExceptionPreformatted(SpannerExceptionFactory.java:396)
at com.google.cloud.spanner.SpannerExceptionFactory.newSpannerException(SpannerExceptionFactory.java:223)
at com.google.cloud.spanner.SpannerExceptionFactory.newSpannerException(SpannerExceptionFactory.java:135)
at com.google.cloud.spanner.GrpcStreamIterator.computeNext(GrpcStreamIterator.java:147)
at com.google.cloud.spanner.GrpcStreamIterator.computeNext(GrpcStreamIterator.java:38)
at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:141)
at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:136)
at com.google.cloud.spanner.ResumableStreamIterator.computeNext(ResumableStreamIterator.java:266)
at com.google.cloud.spanner.ResumableStreamIterator.computeNext(ResumableStreamIterator.java:56)
at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:141)
at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:136)
at com.google.cloud.spanner.GrpcValueIterator.ensureReady(GrpcValueIterator.java:141)
at com.google.cloud.spanner.GrpcValueIterator.getMetadata(GrpcValueIterator.java:113)
at com.google.cloud.spanner.GrpcResultSet.next(GrpcResultSet.java:83)
at com.google.cloud.spanner.AsyncResultSetImpl$ProduceRowsRunnable.run(AsyncResultSetImpl.java:348)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:572)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
at java.base/java.lang.Thread.run(Thread.java:1583)
Suppressed: java.lang.Exception: #block terminated with an error
at reactor.core.publisher.BlockingSingleSubscriber.blockingGet(BlockingSingleSubscriber.java:104)
at reactor.core.publisher.Mono.block(Mono.java:1779)
at org.jooq.testscripts.R2DBC.main(R2DBC.java:49)
Caused by: com.google.cloud.spanner.SpannerException: INVALID_ARGUMENT: io.grpc.StatusRuntimeException: INVALID_ARGUMENT: Syntax error: Unexpected identifier "invalid" [at 1:1]
invalid sql
^ - Statement: 'invalid sql
'
at com.google.cloud.spanner.SpannerExceptionFactory.newSpannerExceptionPreformatted(SpannerExceptionFactory.java:396)
at com.google.cloud.spanner.SpannerExceptionFactory.newSpannerExceptionPreformatted(SpannerExceptionFactory.java:402)
at com.google.cloud.spanner.GrpcStreamIterator$ConsumerImpl.onError(GrpcStreamIterator.java:196)
at com.google.cloud.spanner.spi.v1.GapicSpannerRpc$SpannerResponseObserver.onError(GapicSpannerRpc.java:2219)
at com.google.api.gax.tracing.TracedResponseObserver.onError(TracedResponseObserver.java:104)
at com.google.api.gax.rpc.RetryingServerStreamingCallable$1.onFailure(RetryingServerStreamingCallable.java:99)
at com.google.api.core.ApiFutures$1.onFailure(ApiFutures.java:84)
at com.google.common.util.concurrent.Futures$CallbackListener.run(Futures.java:1125)
at com.google.common.util.concurrent.DirectExecutor.execute(DirectExecutor.java:30)
at com.google.common.util.concurrent.AbstractFuture.executeListener(AbstractFuture.java:1004)
at com.google.common.util.concurrent.AbstractFuture.complete(AbstractFuture.java:767)
at com.google.common.util.concurrent.AbstractFuture.setException(AbstractFuture.java:516)
at com.google.api.gax.retrying.BasicRetryingFuture.handleAttempt(BasicRetryingFuture.java:202)
at com.google.api.gax.retrying.CallbackChainRetryingFuture$AttemptCompletionListener.handle(CallbackChainRetryingFuture.java:135)
at com.google.api.gax.retrying.CallbackChainRetryingFuture$AttemptCompletionListener.run(CallbackChainRetryingFuture.java:117)
at com.google.common.util.concurrent.DirectExecutor.execute(DirectExecutor.java:30)
at com.google.common.util.concurrent.AbstractFuture.executeListener(AbstractFuture.java:1004)
at com.google.common.util.concurrent.AbstractFuture.complete(AbstractFuture.java:767)
at com.google.common.util.concurrent.AbstractFuture.setException(AbstractFuture.java:516)
at com.google.api.core.AbstractApiFuture$InternalSettableFuture.setException(AbstractApiFuture.java:92)
at com.google.api.core.AbstractApiFuture.setException(AbstractApiFuture.java:74)
at com.google.api.core.SettableApiFuture.setException(SettableApiFuture.java:51)
at com.google.api.gax.rpc.ServerStreamingAttemptCallable.onAttemptError(ServerStreamingAttemptCallable.java:366)
at com.google.api.gax.rpc.ServerStreamingAttemptCallable.access$600(ServerStreamingAttemptCallable.java:96)
at com.google.api.gax.rpc.ServerStreamingAttemptCallable$2.onErrorImpl(ServerStreamingAttemptCallable.java:237)
at com.google.api.gax.rpc.StateCheckingResponseObserver.onError(StateCheckingResponseObserver.java:84)
at com.google.api.gax.rpc.Watchdog$WatchdogStream.onErrorImpl(Watchdog.java:348)
at com.google.api.gax.rpc.StateCheckingResponseObserver.onError(StateCheckingResponseObserver.java:84)
at com.google.api.gax.grpc.ExceptionResponseObserver.onErrorImpl(ExceptionResponseObserver.java:84)
at com.google.api.gax.rpc.StateCheckingResponseObserver.onError(StateCheckingResponseObserver.java:84)
at com.google.api.gax.grpc.GrpcDirectStreamController$ResponseObserverAdapter.onClose(GrpcDirectStreamController.java:148)
at io.grpc.PartialForwardingClientCallListener.onClose(PartialForwardingClientCallListener.java:39)
at io.grpc.ForwardingClientCallListener.onClose(ForwardingClientCallListener.java:23)
at io.grpc.ForwardingClientCallListener$SimpleForwardingClientCallListener.onClose(ForwardingClientCallListener.java:40)
at com.google.api.gax.grpc.ChannelPool$ReleasingClientCall$1.onClose(ChannelPool.java:569)
at io.grpc.PartialForwardingClientCallListener.onClose(PartialForwardingClientCallListener.java:39)
at io.grpc.ForwardingClientCallListener.onClose(ForwardingClientCallListener.java:23)
at io.grpc.ForwardingClientCallListener$SimpleForwardingClientCallListener.onClose(ForwardingClientCallListener.java:40)
at io.grpc.opentelemetry.OpenTelemetryMetricsModule$MetricsClientInterceptor$1$1.onClose(OpenTelemetryMetricsModule.java:603)
at io.grpc.PartialForwardingClientCallListener.onClose(PartialForwardingClientCallListener.java:39)
at io.grpc.ForwardingClientCallListener.onClose(ForwardingClientCallListener.java:23)
at io.grpc.ForwardingClientCallListener$SimpleForwardingClientCallListener.onClose(ForwardingClientCallListener.java:40)
at io.grpc.PartialForwardingClientCallListener.onClose(PartialForwardingClientCallListener.java:39)
at io.grpc.ForwardingClientCallListener.onClose(ForwardingClientCallListener.java:23)
at io.grpc.ForwardingClientCallListener$SimpleForwardingClientCallListener.onClose(ForwardingClientCallListener.java:40)
at com.google.cloud.spanner.spi.v1.SpannerErrorInterceptor$1$1.onClose(SpannerErrorInterceptor.java:107)
at io.grpc.PartialForwardingClientCallListener.onClose(PartialForwardingClientCallListener.java:39)
at io.grpc.ForwardingClientCallListener.onClose(ForwardingClientCallListener.java:23)
at io.grpc.ForwardingClientCallListener$SimpleForwardingClientCallListener.onClose(ForwardingClientCallListener.java:40)
at com.google.api.gax.grpc.GrpcLoggingInterceptor$1$1.onClose(GrpcLoggingInterceptor.java:98)
at io.grpc.internal.ClientCallImpl.closeObserver(ClientCallImpl.java:565)
at io.grpc.internal.ClientCallImpl.access$100(ClientCallImpl.java:72)
at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1StreamClosed.runInternal(ClientCallImpl.java:733)
at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1StreamClosed.runInContext(ClientCallImpl.java:714)
at io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37)
at io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:133)
... 3 more
Caused by: com.google.cloud.spanner.SpannerException: INVALID_ARGUMENT: io.grpc.StatusRuntimeException: INVALID_ARGUMENT: Syntax error: Unexpected identifier "invalid" [at 1:1]
invalid sql
^
at com.google.cloud.spanner.SpannerExceptionFactory.newSpannerExceptionPreformatted(SpannerExceptionFactory.java:396)
at com.google.cloud.spanner.SpannerExceptionFactory.fromApiException(SpannerExceptionFactory.java:418)
at com.google.cloud.spanner.SpannerExceptionFactory.newSpannerException(SpannerExceptionFactory.java:227)
at com.google.cloud.spanner.SpannerExceptionFactory.newSpannerException(SpannerExceptionFactory.java:135)
... 56 more
Caused by: io.grpc.StatusRuntimeException: INVALID_ARGUMENT: Syntax error: Unexpected identifier "invalid" [at 1:1]
invalid sql
^
at io.grpc.Status.asRuntimeException(Status.java:532)
... 29 more
```