E2E test: remove view_merge_requests_spec from quarantine

What does this MR do and why?

Revert "Merge branch 'jmc-quarantine-302' into 'master'"

This reverts merge request !165905 (merged) and allows a 302 due to URL normalisation in live environments

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

How to set up and validate locally

QA_GITLAB_URL=https://gdk.test:3333 bundle exec rspec qa/specs/features/api/3_create/merge_request/view_merge_requests_spec.rb

QA_LOG_LEVEL=debug QA_GITLAB_URL=https://staging.gitlab.com bundle exec rspec qa/specs/features/api/3_create/merge_request/view_merge_requests_spec.rb