Enable remaining PSC config options in modules/alloydb (#4000)

* Add PSC config variables

* Remove locals

* fmt

* Updates from Automated PR Review

tests/modules/alloydb/examples/psc_auto.yaml

@@ -0,0 +1,83 @@
+# Copyright 2026 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
+#
+#     https://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.
+
+values:
+  module.alloydb.google_alloydb_cluster.primary:
+    annotations: null
+    cluster_id: db
+    cluster_type: PRIMARY
+    continuous_backup_config:
+    - enabled: true
+      encryption_config: []
+      recovery_window_days: 14
+    database_version: POSTGRES_15
+    display_name: db
+    effective_labels:
+      goog-terraform-provisioned: 'true'
+    encryption_config: []
+    etag: null
+    initial_user: []
+    labels: null
+    location: europe-west8
+    maintenance_update_policy: []
+    project: project-id
+    psc_config:
+    - psc_enabled: true
+    restore_backup_source: []
+    restore_backupdr_backup_source: []
+    restore_backupdr_pitr_source: []
+    restore_continuous_backup_source: []
+    secondary_config: []
+    skip_await_major_version_upgrade: true
+    subscription_type: STANDARD
+    terraform_labels:
+      goog-terraform-provisioned: 'true'
+    timeouts: null
+  module.alloydb.google_alloydb_instance.primary:
+    annotations: null
+    availability_type: REGIONAL
+    connection_pool_config: []
+    display_name: db
+    effective_labels:
+      goog-terraform-provisioned: 'true'
+    gce_zone: null
+    instance_id: db
+    instance_type: PRIMARY
+    labels: null
+    machine_config:
+    - cpu_count: 2
+    psc_instance_config:
+    - allowed_consumer_projects:
+      - '123'
+      psc_auto_connections:
+      - consumer_network: projects/xxx/global/networks/aaa
+        consumer_project: project-id
+      psc_interface_configs: []
+    query_insights_config:
+    - query_plans_per_minute: 5
+      query_string_length: 1024
+      record_application_tags: true
+      record_client_address: true
+    read_pool_config: []
+    terraform_labels:
+      goog-terraform-provisioned: 'true'
+    timeouts: null
+
+counts:
+  google_alloydb_cluster: 1
+  google_alloydb_instance: 1
+  modules: 1
+  resources: 2
+
+outputs: {}