refactor: deprecate v13 properties and methods (#7782)

* refactor: deprecate splitting

* refactor: deprecate `IntegrationApplication#summary`

https://github.com/discordjs/discord.js/pull/7729

* docs: amend store channel wording

* refactor: deprecate fetching of application assets

* docs: deprecate vip field in voice regions

src/structures/IntegrationApplication.js

@@ -54,6 +54,7 @@ class IntegrationApplication extends Application {
       /**
        * The application's summary
        * @type {?string}
+       * @deprecated This property is no longer being sent by the API.
        */
       this.summary = data.summary;
     } else {

src/structures/StoreChannel.js

@@ -4,7 +4,7 @@ const GuildChannel = require('./GuildChannel');
 
 /**
  * Represents a guild store channel on Discord.
- * <warn>Store channels are deprecated and will be removed from Discord in March 2022. See
+ * <warn>Store channels have been removed from Discord. See
  * [Self-serve Game Selling Deprecation](https://support-dev.discord.com/hc/en-us/articles/4414590563479)
  * for more information.</warn>
  * @extends {GuildChannel}

src/structures/VoiceRegion.js

@@ -22,6 +22,7 @@ class VoiceRegion {
     /**
      * Whether the region is VIP-only
      * @type {boolean}
+     * @deprecated This property is no longer being sent by the API.
      */
     this.vip = data.vip;
 

src/structures/interfaces/Application.js

@@ -1,11 +1,14 @@
 'use strict';
 
+const process = require('node:process');
 const { ClientApplicationAssetTypes, Endpoints } = require('../../util/Constants');
 const SnowflakeUtil = require('../../util/SnowflakeUtil');
 const Base = require('../Base');
 
 const AssetTypes = Object.keys(ClientApplicationAssetTypes);
 
+let deprecationEmittedForFetchAssets = false;
+
 /**
  * Represents an OAuth2 Application.
  * @abstract
@@ -103,8 +106,18 @@ class Application extends Base {
   /**
    * Gets the application's rich presence assets.
    * @returns {Promise<Array<ApplicationAsset>>}
+   * @deprecated This will be removed in the next major as it is unsupported functionality.
    */
   async fetchAssets() {
+    if (!deprecationEmittedForFetchAssets) {
+      process.emitWarning(
+        'Application#fetchAssets is deprecated as it is unsupported and will be removed in the next major version.',
+        'DeprecationWarning',
+      );
+
+      deprecationEmittedForFetchAssets = true;
+    }
+
     const assets = await this.client.api.oauth2.applications(this.id).assets.get();
     return assets.map(a => ({
       id: a.id,