chore: disable Firefox in system test for screenshot timeout bugfix (#…

…29117)

* chore: disable firefox for issue 5016 system test

* link to flake issue for firefox screenshot timeout

* empty commit to trigger ci

---------

Co-authored-by: Jennifer Shehane <jennifer@cypress.io>

system-tests/test/issue_5016_spec.js

@@ -3,11 +3,21 @@ const systemTests = require('../lib/system-tests').default
 describe('e2e issue 5016 - screenshot times out after clicking target _blank', function () {
   systemTests.setup()
 
+  // this test originally was scoped to !webkit, but Firefox has a (non-regression) flake
+  // issue: https://github.com/cypress-io/cypress/issues/29116
   systemTests.it('fails but does not timeout taking screenshot', {
     project: 'config-screenshot-on-failure-enabled',
     sanitizeScreenshotDimensions: true,
     snapshot: true,
     expectedExitCode: 1,
-    browser: '!webkit',
+    browser: 'chrome',
+  })
+
+  systemTests.it('fails but does not timeout taking screenshot', {
+    project: 'config-screenshot-on-failure-enabled',
+    sanitizeScreenshotDimensions: true,
+    snapshot: true,
+    expectedExitCode: 1,
+    browser: 'electron',
   })
 })