AccountInfoRequest validation connection support

Author: devpreview

src/app/Http/Requests/AccountInfoRequest.php

@@ -41,7 +41,8 @@ public function rules()
             backpack_authentication_column() => [
                 'required',
                 backpack_authentication_column() == 'email' ? 'email' : '',
-                Rule::unique($user->getTable())->ignore($user->getKey(), $user->getKeyName()),
+                Rule::unique($user->getConnectionName() ? $user->getConnectionName() . '.' . $user->getTable() : $user->getTable())
+                    ->ignore($user->getKey(), $user->getKeyName()),
             ],
             'name' => 'required',
         ];