feat(server,web): make user deletion delay configurable (#7663)

* feat(server,web): make user deletion delay configurable

* alphabetical order

* add min for user.deleteDelay in SettingInputField

* make config.user.deleteDelay SettingInputField min consistent format

* fix e2e test

* update description on user delete delay

mobile/openapi/test/system_config_user_dto_test.dart

@@ -0,0 +1,27 @@
+//
+// AUTO-GENERATED FILE, DO NOT MODIFY!
+//
+// @dart=2.12
+
+// ignore_for_file: unused_element, unused_import
+// ignore_for_file: always_put_required_named_parameters_first
+// ignore_for_file: constant_identifier_names
+// ignore_for_file: lines_longer_than_80_chars
+
+import 'package:openapi/api.dart';
+import 'package:test/test.dart';
+
+// tests for SystemConfigUserDto
+void main() {
+  // final instance = SystemConfigUserDto();
+
+  group('test SystemConfigUserDto', () {
+    // int deleteDelay
+    test('to test the property `deleteDelay`', () async {
+      // TODO
+    });
+
+
+  });
+
+}