[MGDSTRM-9160] Process authentication and end-points as blocking

Avoids complexity of running various subtasks of some operations on a
worker thread.

kafka-admin/src/main/java/org/bf2/admin/kafka/admin/handlers/RestOperations.java

@@ -37,6 +37,7 @@
 import java.util.stream.Collectors;
 
 @Path("/api/v1")
+@Blocking
 public class RestOperations implements OperationsHandler {
 
     private static final Logger log = Logger.getLogger(RestOperations.class);
@@ -128,7 +129,6 @@ public CompletionStage<Response> listTopics(String filter, Types.DeprecatedPageR
                .thenApply(topicList -> Response.ok().entity(topicList).build());
     }
 
-    @Blocking
     @Counted("consume_records_requests")
     @Timed("consume_records_request_time")
     public Response consumeRecords(String topicName,

kafka-admin/src/main/resources/application.properties

@@ -29,6 +29,7 @@ quarkus.index-dependency.kafka-clients.artifact-id=kafka-clients
 
 # The following properties will be used when adding JWT RBAC provided by quarkus-smallrye-jwt
 quarkus.smallrye-jwt.enabled=true
+quarkus.smallrye-jwt.blocking-authentication=true
 mp.jwt.verify.publickey.location=${kafka.admin.oauth.jwks.endpoint.uri: }
 mp.jwt.verify.issuer=${kafka.admin.oauth.valid.issuer.uri: }
 smallrye.jwt.client.tls.certificate=${kafka.admin.oauth.trusted.cert:}