🧑‍💻 refactor: Display Client-facing Errors (#2476)

* fix(Google): allow presets to configure expected maxOutputTokens

* refactor: standardize client-facing errors

* refactor(checkUserKeyExpiry): pass endpoint instead of custom message

* feat(UserService): JSDocs and getUserKeyValues

* refactor: add NO_BASE_URL error type, make use of getUserKeyValues, throw user-specific errors

* ci: update tests with recent changes

packages/data-provider/src/config.ts

@@ -515,6 +515,32 @@ export enum ViolationTypes {
   BAN = 'ban',
 }
 
+/**
+ * Enum for error message types that are not "violations" as above, used to identify client-facing errors.
+ */
+export enum ErrorTypes {
+  /**
+   * No User-provided Key.
+   */
+  NO_USER_KEY = 'no_user_key',
+  /**
+   * Expired User-provided Key.
+   */
+  EXPIRED_USER_KEY = 'expired_user_key',
+  /**
+   * Invalid User-provided Key.
+   */
+  INVALID_USER_KEY = 'invalid_user_key',
+  /**
+   * No Base URL Provided.
+   */
+  NO_BASE_URL = 'no_base_url',
+  /**
+   * Moderation error
+   */
+  MODERATION = 'moderation',
+}
+
 /**
  * Enum for authentication keys.
  */