[I] [Java] Users Exception metadata thrown by method FlightServerMiddleware.onCallStarted() getting override and set to empty value [arrow]

["PANKAJ9768 (via GitHub)" <gi...@apache.org>]

PANKAJ9768 opened a new issue, #44937:
URL: https://github.com/apache/arrow/issues/44937

   ### 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


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