Replace unused, deprecated disk_size_gb field with disk_size_gib field in managedkafka (#15944)

Author: andreigurau

mmv1/products/managedkafka/Cluster.yaml

@@ -154,9 +154,9 @@ properties:
     description: "Capacity configuration at a per-broker level within the Kafka cluster. The config will be appled to each broker in the cluster."
     ignore_read: true
     properties:
-      - name: 'diskSizeGb'
+      - name: 'diskSizeGib'
         type: String
-        description: "The disk to provision for each broker in Gigabytes. Minimum: 100 GB."
+        description: "The disk to provision for each broker in Gibibytes. Minimum: 100 GiB."
   - name: 'rebalanceConfig'
     type: NestedObject
     description: "Defines rebalancing behavior of a Kafka cluster."

mmv1/third_party/terraform/services/managedkafka/resource_managed_kafka_cluster_test.go

@@ -89,7 +89,7 @@ resource "google_managed_kafka_cluster" "example" {
     memory_bytes = 4512135122
   }
   broker_capacity_config {
-    disk_size_gb = 1500
+    disk_size_gib = 1500
   }
   gcp_config {
     access_config {