[Java] User's Exception's metadata thrown by method FlightServerMiddleware.onCallStarted() getting override and set to empty value

### Describe the bug, including details regarding any error messages, version, and platform.

In flight producer , User is throwing StatusRuntimeException having metadata with custom error message from the implementation class of [FlightServerMiddleware.onCallStarted](https://github.com/apache/arrow/blob/main/java/flight/flight-core/src/main/java/org/apache/arrow/flight/FlightServerMiddleware.java#L52) ,
eg:
`
Metadata trailers=new Metadata();
trailers.put(Metadata.key.of("custom_msg",Metadata.ASCII_STRING_MARSHALLER),"custom error msg");
throw StatusUtils.fromGrpcRuntimeException(new StatusRuntimeException(Status.UNAUTHENTICATED,trailers) );
`
But this is getting override in in catch block of [ServerInterceptorAdapter.interceptCall](https://github.com/apache/arrow/blob/ded148c2ef5dd441a3b6ab9496d0ed0aeb940f71/java/flight/flight-core/src/main/java/org/apache/arrow/flight/grpc/ServerInterceptorAdapter.java#L104) ,

Because of this at flight client side user is not able to propagate meaning error message , Only correct status is received at client side .

Expectation :
Metadata from FlightRuntimeException should be used while closing the call .
[ServerInterceptorAdapter.interceptCall](https://github.com/apache/arrow/blob/ded148c2ef5dd441a3b6ab9496d0ed0aeb940f71/java/flight/flight-core/src/main/java/org/apache/arrow/flight/grpc/ServerInterceptorAdapter.java#L104)
`
call.close(StatusUtils.toGrpcStatus(e.status()), e.status().metadata());
`

### Component(s)

FlightRPC, Java

Commencez dans java/flight/flight-core/src/main/java/org/apache/arrow/flight/grpc/ServerInterceptorAdapter.java, au niveau du bloc catch de interceptCall, puis lisez FlightServerMiddleware.onCallStarted et StatusUtils. Vérifiez que les métadonnées d’une FlightRuntimeException sont conservées lorsque l’appel se termine, et confirmez que le client reçoit la valeur de trailer personnalisée au lieu d’une valeur vide.

Rédigé par le modèle d'indexation à partir du texte de l'issue.