Fail earlier if a test attempts to flip feature flags without appropriate RSpec metadata
# Problem
A fix (https://gitlab.com/gitlab-org/gitlab/-/merge_requests/154789+) was filed after a test [started failing](https://ops.gitlab.net/gitlab-org/quality/canary/-/jobs/14131332) in Canary.
This failure should not have made it far enough to reach Canary.
# Proposal
Implement a detection mechanism on the end-to-end tests that **fail** the end-to-end test if it attempts to flip feature flags without containing the appropriate RSpec metadata (`:skip_live_env`)
**Possibility:** Make a Cop to enforce this?
issue