E2E: Dequarantine Project templates spec

The failure here has been resolved, and therefore we should be good to
dequarantine this spec again.

Quarantined MR: https://gitlab.com/gitlab-org/gitlab/-/issues/436948
Failure Issue: https://gitlab.com/gitlab-org/gitlab/-/issues/436948
Fixed By: https://gitlab.com/gitlab-org/gitlab/-/issues/391591