Chore: Remove legacy AC checks from team (#68715)

* removing legacy AC checks from team API handlers

* Chore: remove `UserIDFilter` from team queries (#68820)

* remove userIDfilter from team queries in favour of RBAC SQL filtering

* fix typo

* remove redundant tests

* remove another unused function

* fix failing test

pkg/api/admin_users.go

@@ -235,7 +235,7 @@ func (hs *HTTPServer) AdminDeleteUser(c *contextmodel.ReqContext) response.Respo
 		return nil
 	})
 	g.Go(func() error {
-		if err := hs.teamGuardian.DeleteByUser(ctx, cmd.UserID); err != nil {
+		if err := hs.teamService.RemoveUsersMemberships(ctx, cmd.UserID); err != nil {
 			return err
 		}
 		return nil