fix: reverting unintentional breaking change: GetOpenIdConfigRequest, GetOpenIdConfigResponse

protos/google/container/v1/cluster_service.proto

@@ -3384,6 +3384,39 @@ message ServiceExternalIPsConfig {
   bool enabled = 1;
 }
 
+// GetOpenIDConfigRequest gets the OIDC discovery document for the
+// cluster. See the OpenID Connect Discovery 1.0 specification for details.
+message GetOpenIDConfigRequest {
+  // The cluster (project, location, cluster name) to get the discovery document
+  // for. Specified in the format `projects/*/locations/*/clusters/*`.
+  string parent = 1;
+}
+
+// GetOpenIDConfigResponse is an OIDC discovery document for the cluster.
+// See the OpenID Connect Discovery 1.0 specification for details.
+message GetOpenIDConfigResponse {
+  // OIDC Issuer.
+  string issuer = 1;
+
+  // JSON Web Key uri.
+  string jwks_uri = 2;
+
+  // Supported response types.
+  repeated string response_types_supported = 3;
+
+  // Supported subject types.
+  repeated string subject_types_supported = 4;
+
+  // supported ID Token signing Algorithms.
+  repeated string id_token_signing_alg_values_supported = 5;
+
+  // Supported claims.
+  repeated string claims_supported = 6;
+
+  // Supported grant types.
+  repeated string grant_types = 7;
+}
+
 // GetJSONWebKeysRequest gets the public component of the keys used by the
 // cluster to sign token requests. This will be the jwks_uri for the discover
 // document returned by getOpenIDConfig. See the OpenID Connect