[QUARANTINE] [nightly] Verify Pipeline with protected variable does not expose variable on unprotected branch

What does this MR do?

Quarantines the test Verify Pipeline with protected variable does not expose variable on unprotected branch (https://gitlab.com/gitlab-org/gitlab/-/blob/master/qa/qa/specs/features/browser_ui/4_verify/ci_variable/pipeline_with_protected_variable_spec.rb#L77)

This test has been found by Confiner to have failed 4 times, which exceeds the threshold of 3 times.

1. ee:update
2. ce:upgrade
3. ee:nplus1-instance-image
4. ee:instance-image-slow-network

#396635 (closed)

(This MR was automatically generated by Confiner at 2023-03-17 01:17:56 UTC)