resource owners: Render username with display name to avoid confusion

[benbroadaway]

https://github.com/walmartlabs/concord/blob/b48162d1d0b844759762ef5fafc496a42a65f2cf/console2/src/components/organisms/FindUserField2/index.tsx#L40

It's possible for multiple users (different usernames) to have the same display name. This can be a tad confusing in the UI when viewing at existing owners of resources. Some format like Display name (username) or Display Name - username should suffice.