Fix flaky Key_Shared subscription related tests (#970)

### Motivation

After #953, the Pulsar
version was upgraded from 2.8.3 to 2.10.3. However,
[PIP-119](apache/pulsar#13352) changed the
default value of `subscriptionKeySharedUseConsistentHashing` to true,
which leads to the flakiness of Key_Shared subscription related tests.

Example: https://github.com/apache/pulsar-client-go/actions/runs/4291098473/jobs/7475868787

### Modifications

Configure `subscriptionKeySharedUseConsistentHashing` with `false`.

integration-tests/conf/standalone.conf

@@ -312,4 +312,6 @@ systemTopicEnabled=true
 
 # The schema compatibility strategy is used for system topics.
 # Available values: ALWAYS_INCOMPATIBLE, ALWAYS_COMPATIBLE, BACKWARD, FORWARD, FULL, BACKWARD_TRANSITIVE, FORWARD_TRANSITIVE, FULL_TRANSITIVE
-systemTopicSchemaCompatibilityStrategy=ALWAYS_COMPATIBLE
+systemTopicSchemaCompatibilityStrategy=ALWAYS_COMPATIBLE
+
+subscriptionKeySharedUseConsistentHashing=false