feat: [networkconnectivity] add Network Connectivity Center APIs for PSC service automation (#6207)

* feat: add Network Connectivity Center APIs for PSC service automation
docs: update some documentation.

PiperOrigin-RevId: 739170914

Source-Link: googleapis/googleapis@d2dcfcf

Source-Link: googleapis/googleapis-gen@757e831
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* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>
Co-authored-by: danieljbruce <danieljbruce@users.noreply.github.com>
Co-authored-by: Megan Potter <57276408+feywind@users.noreply.github.com>

Author: 3 people

packages/google-cloud-networkconnectivity/README.md

@@ -35,6 +35,14 @@ option (google.api.resource_definition) = {
   type: "compute.googleapis.com/Network"
   pattern: "projects/{project}/global/networks/{resource_id}"
 };
+option (google.api.resource_definition) = {
+  type: "compute.googleapis.com/Subnetwork"
+  pattern: "projects/{project}/regions/{region}/subnetworks/{subnetwork}"
+};
+option (google.api.resource_definition) = {
+  type: "compute.googleapis.com/ServiceAttachment"
+  pattern: "projects/{project}/regions/{region}/serviceAttachments/{service_attachment}"
+};
 
 // Represents the metadata of the long-running operation.
 message OperationMetadata {
@@ -57,9 +65,10 @@ message OperationMetadata {
 
   // Output only. Identifies whether the user has requested cancellation
   // of the operation. Operations that have been cancelled successfully
-  // have [Operation.error][] value with a
-  // [google.rpc.Status.code][google.rpc.Status.code] of 1, corresponding to
-  // `Code.CANCELLED`.
+  // have
+  // [google.longrunning.Operation.error][google.longrunning.Operation.error]
+  // value with a [google.rpc.Status.code][google.rpc.Status.code] of 1,
+  // corresponding to `Code.CANCELLED`.
   bool requested_cancellation = 6 [(google.api.field_behavior) = OUTPUT_ONLY];
 
   // Output only. API version used to start the operation.