feat(security_center_v2): add sample for setting custom endpoint

Author: hegemonic

security_center_v2/security_center_v2_endpoint_us/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 security_center_v2_endpoint_us]
+provider "google" {
+  alias                              = "security_center_v2_endpoint_us"
+  security_center_v2_custom_endpoint = "https://securitycenter.us.rep.googleapis.com/v2/"
+}
+# [END security_center_v2_endpoint_us]

security_center_v2/security_center_v2_endpoint_us/test.yaml

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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.
+
+apiVersion: blueprints.cloud.google.com/v1alpha1
+kind: BlueprintTest
+metadata:
+  name: security_center_v2_endpoint_us
+spec:
+  skip: true