Disable Sidekiq feature flag check if features table does not exist
Disable Sidekiq feature flag check if features table does not exist

The GitLab Development Kit initialization failed because the Sidekiq
initializer was attempting to look up a feature flag when the `features`
table hadn't been created yet.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/54718

mmkassem/gitlabhq,dreampet/gitlab,stoplightio/gitlabhq,dreampet/gitlab,dreampet/gitlab,dreampet/gitlab,iiet/iiet-git,axilleas/gitlabhq,mmkassem/gitlabhq,stoplightio/gitlabhq,axilleas/gitlabhq,stoplightio/gitlabhq,mmkassem/gitlabhq,mmkassem/gitlabhq,iiet/iiet-git,iiet/iiet-git,stoplightio/gitlabhq,axilleas/gitlabhq,iiet/iiet-git,axilleas/gitlabhq