Add unstable flag to test metadata for popup height check

Author: pharret31

e2e/testcafe-devextreme/tests/editors/lookup/common.ts

@@ -98,7 +98,7 @@ test.meta({ browserSize: [300, 400] })('Check popup height with no found data op
     .ok(compareResults.errorMessages());
 }).before(async () => createWidget('dxLookup', { dataSource: [], searchEnabled: true }));
 
-test.meta({ browserSize: [300, 400] })('Check popup height in loading state', async (t) => {
+test.meta({ browserSize: [300, 400], unstable: true })('Check popup height in loading state', async (t) => {
   const { takeScreenshot, compareResults } = createScreenshotsComparer(t);
 
   await t.click(Selector(`.${LOOKUP_FIELD_CLASS}`));