[BUG] Delete member API permission issue

Entitlements service has an API: DELETE /members/{member_email}
This API is used to remove member from every group where he is a member or an owner within a data partition.
To access this API the requestor should have OPS role.

Issue to address: internally requestor is also checked to be an owner of the group, from which he removes a user. This should not be done, because requestor has ops role.

**How to reproduce the issue:**
Given: user A, user B, user C. User C has OPS role.
User A creates a group.
User A adds user B as a member in the new group.
Group is created, User A is an OWNER and User B is a MEMBER.
User C calls API DELETE /members/{member_email} to delete user from all groups.
Actual result: 401 returned "Not authorized to manage members"
Expected result: 204