[QUARANTINE] [nightly] Verify UI defined variable is inheritable when forward:pipeline_variables is true

What does this MR do?

Quarantines the test Verify UI defined variable is inheritable when forward:pipeline_variables is true (https://gitlab.com/gitlab-org/gitlab/-/blob/master/qa/qa/specs/features/browser_ui/4_verify/ci_variable/ui_variable_inheritable_when_forward_pipeline_variables_true_spec.rb#L25)

This test has been found by Confiner to have failed 10 times, which exceeds the threshold of 3 times.

1. ce:update
2. ee:update
3. ee-previous-to-ce:update
4. ce:upgrade
5. ce:instance-image
6. ee:instance-image
7. ce:instance-image-slow-network
8. ee:instance-image-slow-network
9. ce:nplus1-instance-image
10. ee:nplus1-instance-image

#361338 (closed)

(This MR was automatically generated by Confiner at 2022-05-06 01:17:35 UTC)