tgc-revival: add google_vpc_access_connector to TGC (#15822)

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>

Author: zli82016

mmv1/products/vpcaccess/Connector.yaml

@@ -15,6 +15,8 @@
 name: 'Connector'
 kind: 'vpcaccess#Connector'
 description: 'Serverless VPC Access connector resource.'
+include_in_tgc_next: true
+tgc_include_handwritten_tests: true
 references:
   guides:
     'Configuring Serverless VPC Access': 'https://cloud.google.com/vpc/docs/configure-serverless-vpc-access'
@@ -37,9 +39,11 @@ async:
     base_url: '{{op_id}}'
   result:
     resource_inside_response: true
+tgc_ignore_terraform_decoder: true
 custom_code:
   encoder: 'templates/terraform/encoders/no_send_name.go.tmpl'
   decoder: 'templates/terraform/decoders/long_name_to_self_link.go.tmpl'
+  tgc_decoder: 'templates/tgc_next/decoders/vpc_access_connector_decoder.go.tmpl'
   post_create: 'templates/terraform/post_create/sleep.go.tmpl'
   constants: 'templates/terraform/constants/vpc_access_connector.go.tmpl'
   pre_update: 'templates/terraform/pre_update/vpc_access_connector_instances.go.tmpl'
@@ -77,6 +81,7 @@ properties:
     required: true
     custom_flatten: 'templates/terraform/custom_flatten/name_from_self_link.tmpl'
     immutable: true
+    tgc_ignore_read: true
   - name: 'network'
     type: String
     description: |

mmv1/templates/tgc_next/decoders/vpc_access_connector_decoder.go.tmpl

@@ -0,0 +1,28 @@
+{{/*
+	The license inside this block applies to this file
+	Copyright 2025 Google Inc.
+	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.
+*/ -}}
+	// When converting from CAI to HCL, both network and subnet may be present in the Asset.
+	// However, Terraform schema requires exactly one of them.
+	// We prefer 'subnet' if it's present and valid.
+	if _, ok := res["subnet"]; ok {
+		delete(res, "network")
+	}
+
+	// Similarly for instances vs throughput. Prefer instances as throughput is discouraged.
+	if _, ok := res["minInstances"]; ok {
+		delete(res, "minThroughput")
+	}
+	if _, ok := res["maxInstances"]; ok {
+		delete(res, "maxThroughput")
+	}
+
+	return res, hclData, nil