[IMP] mail: remove outdated Messaging/isQUnitTest field

closes odoo/odoo#87816

Signed-off-by: Sébastien Theys (seb) <seb@odoo.com>

addons/mail/static/src/models/messaging.js

@@ -322,14 +322,6 @@ registerModel({
         isNotificationPermissionDefault: attr({
             compute: '_computeIsNotificationPermissionDefault',
         }),
-        /**
-         * States whether the current environment is QUnit test. Useful to
-         * disable some features that are not possible to test due to
-         * technical limitations.
-         */
-        isQUnitTest: attr({
-            default: false,
-        }),
         locale: one('Locale', {
             default: insertAndReplace(),
             isCausal: true,

addons/mail/static/tests/helpers/test_utils.js

@@ -777,7 +777,6 @@ async function start(param0 = {}) {
             messagingValues: {
                 autofetchPartnerImStatus: false,
                 disableAnimation: true,
-                isQUnitTest: true,
                 loadingBaseDelayDuration,
                 messagingBus,
             },