fix: improve smtp email validation and fix enableAndDisableSSO mutation (#3689)

Co-authored-by: Balu Babu <balub997@gmail.com>

packages/hoppscotch-backend/src/errors.ts

@@ -28,6 +28,13 @@ export const JSON_INVALID = 'json_invalid';
  */
 export const AUTH_PROVIDER_NOT_SPECIFIED = 'auth/provider_not_specified';
 
+/**
+ * Auth Provider not specified
+ * (Auth)
+ */
+export const AUTH_PROVIDER_NOT_CONFIGURED =
+  'auth/provider_not_configured_correctly';
+
 /**
  * Environment variable "VITE_ALLOWED_AUTH_PROVIDERS" is not present in .env file
  */