group level auth and confidential filters do not honor shared group access

once !166774 (merged) is merged and verified we should switch these to using the Search::GroupsFinder to pull groups with access

The following discussion from !165827 (merged) should be addressed:

• @terrichu started a discussion: (+2 comments)

  issue: This does not correctly pull group access for users with shared access through another group. Can this MR be marked as blocked by !166774 (merged)? Once the Search::GroupsFinder code is merged, it can be used here