fix(frontier): remove leftover grpc-gateway annotations from PAT model

raystack/frontier/v1beta1/models.proto

@@ -280,37 +280,13 @@
   // this value is never persisted in the system so if lost, can't be recovered
   string token = 5 [(google.api.field_behavior) = OUTPUT_ONLY];
 
-  google.protobuf.Timestamp expires_at = 10 [(grpc.gateway.protoc_gen_openapiv2.options.openapiv2_field) = {
-    description: "The time when the PAT expires.",
-    example: "\"2024-06-07T05:39:56.961Z\""
-  }];
-
-  google.protobuf.Timestamp last_used_at = 11 [
-    (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_field) = {
-      description: "The time when the PAT was last used.",
-      example: "\"2024-06-07T05:39:56.961Z\""
-    },
-    (google.api.field_behavior) = OUTPUT_ONLY
-  ];
-
-  google.protobuf.Timestamp created_at = 12 [
-    (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_field) = {
-      description: "The time when the PAT was created.",
-      example: "\"2023-06-07T05:39:56.961Z\""
-    },
-    (google.api.field_behavior) = OUTPUT_ONLY
-  ];
-
-  google.protobuf.Timestamp updated_at = 13 [
-    (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_field) = {
-      description: "The time when the PAT was last updated.",
-      example: "\"2023-06-07T05:39:56.961Z\""
-    },
-    (google.api.field_behavior) = OUTPUT_ONLY
-  ];
+  google.protobuf.Timestamp expires_at = 10;
+  google.protobuf.Timestamp last_used_at = 11 [(google.api.field_behavior) = OUTPUT_ONLY];
+  google.protobuf.Timestamp created_at = 12 [(google.api.field_behavior) = OUTPUT_ONLY];
+  google.protobuf.Timestamp updated_at = 13 [(google.api.field_behavior) = OUTPUT_ONLY];
 
   google.protobuf.Struct metadata = 20;
 }
 
 // JSON Web Key as specified in RFC 7517
 message JSONWebKey {
@@ -318,7 +294,7 @@
   string kty = 1;
 
   // Algorithm.
   string alg = 2;
 
   // Permitted uses for the public keys.
   string use = 3;
@@ -326,7 +302,7 @@
   // Key ID.
   string kid = 4;
 
   // Used for RSA keys.
   string n = 5;
 
   // Used for RSA keys.