docs: Add Managed Kafka Connect terraform sample for Clusters

managedkafka/managedkafka_create_connect_cluster/main.tf

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+/**
+ * Copyright 2025 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+# [START managedkafka_create_connect_cluster_parent]
+resource "google_managed_kafka_cluster" "example-kafka-cluster" {
+  project    = data.google_project.default.project_id
+  cluster_id = "my-cluster-id"
+  location   = "us-central1"
+  capacity_config {
+    vcpu_count   = 3
+    memory_bytes = 3221225472
+  }
+  gcp_config {
+    access_config {
+      network_configs {
+        subnet = "projects/${data.google_project.default.number}/regions/us-central1/subnetworks/default"
+      }
+    }
+  }
+}
+
+# [START managedkafka_create_connect_cluster]
+resource "google_managed_kafka_connect_cluster" "example-kafka-connect-cluster" {
+  provider           = google-beta
+  project            = data.google_project.default.project_id # Replace this with your project ID in quotes
+  connect_cluster_id = "my-connect-cluster-id"
+  location           = "us-central1"
+  kafka_cluster      = google_managed_kafka_cluster.example-kafka-cluster.id # Replace this with the ID of the primary Managed Service for Apache Kafka cluster associated with your Connect cluster in quotes
+  capacity_config {
+    vcpu_count   = 3
+    memory_bytes = 3221225472
+  }
+  gcp_config {
+    access_config {
+      network_configs {
+        primary_subnet = "projects/${data.google_project.default.number}/regions/us-central1/subnetworks/default"
+      }
+    }
+  }
+}
+# [END managedkafka_create_connect_cluster]
+
+data "google_project" "default" {
+  provider = google-beta
+}
+# [END managedkafka_create_connect_cluster_parent]