allow searching for group with ILIKE

In the Admin WebUI when seaching for a group, I can only do so by typing the exact case/match of the start of the group name. It makes more sense to allow the administrator to be able to match any part of the group name, including in a case-insensitive manner.

Today:
typing memb finds members
typing embers does not
typing Members does not either

typing AfricaAd finds AfricaAdmins
typing admins does not

This can be particularly useful when the chosen naming conventions for group names uses suffixes to denote a role (e.g. ContractReviewers, MemoReviewers, ContractAuthors, MemoAuthors, CountryABCAdmins, CountryXYZAdmins --> I could find all "Author" groups by simply typing Authors to quickly assign a user to the correct groups.