Address review feedback

- Reuse single OperationContext in SingleServerClusterSpecification instead of creating two independent instances
- Preserve srvResolutionException when creating filtered ClusterDescription in DeprioritizingSelector

JAVA-6021

Author: vbabanin

driver-core/src/main/com/mongodb/internal/connection/OperationContext.java

@@ -284,6 +284,7 @@ public List<ServerDescription> select(final ClusterDescription clusterDescriptio
                         new ClusterDescription(
                                 clusterDescription.getConnectionMode(),
                                 clusterDescription.getType(),
+                                clusterDescription.getSrvResolutionException(),
                                 nonDeprioritizedServerDescriptions,
                                 clusterDescription.getClusterSettings(),
                                 clusterDescription.getServerSettings()));

driver-core/src/test/unit/com/mongodb/internal/connection/SingleServerClusterSpecification.groovy

@@ -78,10 +78,9 @@ class SingleServerClusterSpecification extends Specification {
         sendNotification(firstServer, STANDALONE)
 
         then:
-        cluster.getServersSnapshot(createOperationContext()
-                        .getTimeoutContext()
-                        .computeServerSelectionTimeout(),
-                createOperationContext().getTimeoutContext()).getServer(firstServer) == factory.getServer(firstServer)
+        def operationContext = createOperationContext()
+        cluster.getServersSnapshot(operationContext.getTimeoutContext().computeServerSelectionTimeout(),
+                operationContext.getTimeoutContext()).getServer(firstServer) == factory.getServer(firstServer)
 
         cleanup:
         cluster?.close()
@@ -95,8 +94,9 @@ class SingleServerClusterSpecification extends Specification {
         cluster.close()
 
         when:
-        cluster.getServersSnapshot(createOperationContext().getTimeoutContext().computeServerSelectionTimeout(),
-                createOperationContext().getTimeoutContext())
+        def operationContext = createOperationContext()
+        cluster.getServersSnapshot(operationContext.getTimeoutContext().computeServerSelectionTimeout(),
+                operationContext.getTimeoutContext())
 
         then:
         thrown(IllegalStateException)