Feature flag alert ignores EE feature flags

The groupglobal search has noticed that not all of our feature flags are reported in the triage issue. For example:

• elasticsearch_use_or_default_operator (13.4)
• elastic_file_name_reverse_optimization (14.7)

The main suspect is this line https://gitlab.com/gitlab-org/gitlab-feature-flag-alert/-/blob/3086c841d153acaa7655bf38d5e01be8906a656e/lib/gitlab/feature_flag_alert/monitor.rb#L76 where we only iterate over CE feature flags and ignore the EE ones.