quarkus: Regression Test: Validation errors on Reactive routes are no longer propagated

Describe the bug

Having these two routes:

@Inject
FruitResource fruitResource;

@Route(methods = HttpMethod.POST, path = "/insert")
void insert(@Body Fruit fruit, RoutingContext context) {
    fruitResource.insertFruit(fruit)
            .onFailure().invoke(context::fail)
            .subscribe().with(id -> context.response().setStatusCode(201).end());
}

@Route(path = "/*", type = Route.HandlerType.FAILURE, produces = "application/json")
void databaseConstraintFailure(PgException e, HttpServerResponse response) {
    response.setStatusCode(400).end();
}

The insert route will insert a fruit item into the database. The databaseConstraintFailure handler will map the database constraints into a 400 Status code.

The above scenario works fine using 1.13.1.Final or later, but not using 999-SNAPSHOT which fails with the next exception:

ERROR: HTTP Request to /insert failed, error id: f1aab3c8-a7f2-464d-8c33-bd4a33af5e31-1
io.vertx.core.VertxException: Transaction already completed
	at io.vertx.sqlclient.impl.TransactionImpl.checkPending(TransactionImpl.java:115)
	at io.vertx.sqlclient.impl.TransactionImpl.rollback(TransactionImpl.java:154)
	at io.vertx.sqlclient.impl.TransactionImpl.rollback(TransactionImpl.java:159)
	at io.vertx.mutiny.sqlclient.Transaction.lambda$rollback$2(Transaction.java:112)
	at io.smallrye.mutiny.vertx.AsyncResultUni.subscribe(AsyncResultUni.java:30)
	at io.smallrye.mutiny.operators.AbstractUni.subscribe(AbstractUni.java:37)
	at io.smallrye.mutiny.operators.uni.UniOnItemTransformToUni.subscribe(UniOnItemTransformToUni.java:25)
	at io.smallrye.mutiny.operators.AbstractUni.subscribe(AbstractUni.java:37)
	at io.smallrye.mutiny.operators.uni.UniOnItemOrFailureFlatMap$UniOnItemOrFailureFlatMapProcessor.performInnerSubscription(UniOnItemOrFailureFlatMap.java:99)
	at io.smallrye.mutiny.operators.uni.UniOnItemOrFailureFlatMap$UniOnItemOrFailureFlatMapProcessor.onFailure(UniOnItemOrFailureFlatMap.java:65)
	at io.smallrye.mutiny.operators.uni.UniOperatorProcessor.onFailure(UniOperatorProcessor.java:44)
	at io.smallrye.mutiny.vertx.AsyncResultUni.lambda$subscribe$1(AsyncResultUni.java:36)
	at io.vertx.mutiny.sqlclient.PreparedQuery$2.handle(PreparedQuery.java:140)
	at io.vertx.mutiny.sqlclient.PreparedQuery$2.handle(PreparedQuery.java:135)
	at io.vertx.core.impl.future.FutureImpl$3.onFailure(FutureImpl.java:128)
	at io.vertx.core.impl.future.FutureBase.emitFailure(FutureBase.java:79)
	at io.vertx.core.impl.future.FutureImpl.tryFail(FutureImpl.java:198)
	at io.vertx.core.impl.future.PromiseImpl.tryFail(PromiseImpl.java:23)
	at io.vertx.sqlclient.impl.QueryResultBuilder.tryFail(QueryResultBuilder.java:118)
	at io.vertx.core.Promise.fail(Promise.java:89)
	at io.vertx.core.Promise.handle(Promise.java:53)
	at io.vertx.sqlclient.impl.TransactionImpl.lambda$null$0(TransactionImpl.java:75)
	at io.vertx.core.impl.future.FutureImpl$3.onSuccess(FutureImpl.java:124)
	at io.vertx.core.impl.future.FutureBase.emitSuccess(FutureBase.java:62)