Adjust group level work item abilities to account for license

What does this MR do and why?

Related to #477221 (closed)

It was decided that instead of using license checks for specific types, all group-level work items should be made available under a single license. Therefore, we will reuse the epics license for these new checks and update its name to a more appropriate one later on.

We are introducing these changes behind the feature flag enforce_check_group_level_work_items_license to be able to break it down into several MRs, otherwise, there would be many spec files to update making this MR too large.

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