IT: enable AsyncTests suite

Since the commit c1e40d7, the Session
`execute(_batch)` methods now clone the Session's Arc, which prevents
UAF if the Session is closed while the requests are still running.

That commit's message says: "we cannot enable `AsyncTests::Close` yet
since it expects that prematurely dropped session awaits all async tasks
before closing". This is now taken care of by the previous commits.
Thus, we can enable the `AsyncTests::Close` test suite.

Author: wprzytula

Makefile

@@ -37,6 +37,7 @@ SCYLLA_TEST_FILTER := $(subst ${SPACE},${EMPTY},ClusterTests.*\
 :DisconnectedNullStringApiArgsTest.*\
 :MetricsTests.*\
 :DcAwarePolicyTest.*\
+:AsyncTests.*\
 :-SchemaMetadataTest.Integration_Cassandra_RegularMetadataNotMarkedVirtual\
 :SchemaMetadataTest.Integration_Cassandra_VirtualMetadata\
 :HeartbeatTests.Integration_Cassandra_HeartbeatFailed\
@@ -95,6 +96,7 @@ CASSANDRA_TEST_FILTER := $(subst ${SPACE},${EMPTY},ClusterTests.*\
 :DisconnectedNullStringApiArgsTest.*\
 :MetricsTests.*\
 :DcAwarePolicyTest.*\
+:AsyncTests.*\
 :-PreparedTests.Integration_Cassandra_FailFastWhenPreparedIDChangesDuringReprepare\
 :SchemaMetadataTest.Integration_Cassandra_RegularMetadataNotMarkedVirtual\
 :SchemaMetadataTest.Integration_Cassandra_VirtualMetadata\