Bump observability to v1.50.0 (#278)

MGDSTRM-10777: KafkaTopicPartitionReplicaSpreadMax firing during broker reboots
MGDSTRM-10459: Alert on unexpected haproxy configuration reloads (that drop connections)
MGDSTRM-9927: unsuccessful logins - exporting *_total instead of *_rate metric

kas-installer-defaults.env

@@ -162,7 +162,7 @@ OCM_CLUSTER_ID="${OCM_CLUSTER_ID:-"dev-dataplane-cluster"}"
 # Repository address and ref to use for the Observability repository. Set these to test with custom Observability resources.
 #
 OBSERVABILITY_CONFIG_REPO="${OBSERVABILITY_CONFIG_REPO:-"https://api.github.com/repos/bf2fc6cc711aee1a0c2a/observability-resources-mk/contents"}"
-OBSERVABILITY_CONFIG_TAG="${OBSERVABILITY_CONFIG_TAG:-"v1.49.1"}"
+OBSERVABILITY_CONFIG_TAG="${OBSERVABILITY_CONFIG_TAG:-"v1.50.0"}"
 
 # [optional]
 # Default cloud provider