Add Note.url GraphQL field

This adds the `url` field to the `Note` type.

app/graphql/types/notes/note_type.rb

@@ -46,6 +46,13 @@ module Types
       field :confidential, GraphQL::BOOLEAN_TYPE, null: true,
             description: 'Indicates if this note is confidential',
             method: :confidential?
+      field :url, GraphQL::STRING_TYPE,
+            null: true,
+            description: 'URL to view this Note in the Web UI'
+
+      def url
+        ::Gitlab::UrlBuilder.build(object)
+      end
 
       def system_note_icon_name
         SystemNoteHelper.system_note_icon_name(object) if object.system?

doc/api/graphql/reference/gitlab_schema.graphql

@@ -16050,6 +16050,11 @@ type Note implements ResolvableInterface {
   """
   updatedAt: Time!
 
+  """
+  URL to view this Note in the Web UI
+  """
+  url: String
+
   """
   Permissions for the current user on the resource
   """

doc/api/graphql/reference/gitlab_schema.json

@@ -47541,6 +47541,20 @@
               "isDeprecated": false,
               "deprecationReason": null
             },
+            {
+              "name": "url",
+              "description": "URL to view this Note in the Web UI",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "SCALAR",
+                "name": "String",
+                "ofType": null
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
             {
               "name": "userPermissions",
               "description": "Permissions for the current user on the resource",

doc/api/graphql/reference/index.md

@@ -2430,6 +2430,7 @@ Autogenerated return type of NamespaceIncreaseStorageTemporarily.
 | `system` | Boolean! | Indicates whether this note was created by the system or by a user |
 | `systemNoteIconName` | String | Name of the icon corresponding to a system note |
 | `updatedAt` | Time! | Timestamp of the note's last activity |
+| `url` | String | URL to view this Note in the Web UI |
 | `userPermissions` | NotePermissions! | Permissions for the current user on the resource |
 
 ### NotePermissions

spec/graphql/types/notes/note_type_spec.rb

@@ -22,6 +22,7 @@ RSpec.describe GitlabSchema.types['Note'] do
       system_note_icon_name
       updated_at
       user_permissions
+      url
     ]
 
     expect(described_class).to have_graphql_fields(*expected_fields)