Remove `promo_` implicit licensed feature flags
What does this MR do?
Related to: #246758 (closed)
This is added for a purpose that once we start tracking all licensed feature flags this effectively doubles amount of YAML-definitions that has to be created
This reverts changes introduced by !27412 (merged), the promo_ feature flag check.
The intent of promo_<licensed_feature> was to allow enabling feature for everyone skipping license check. This does introduce a number of implicit licensed feature flags connected with that.
According to https://gitlab.com/gitlab-com/gl-infra/feature-flag-log/-/issues?scope=all&utf8=%E2%9C%93&state=all&search=promo_ we did not ever use this promo_ check. To reduce a complexity of amount of feature flags present in source code we should remove it and consider adding another method if this deems to be useful.