Add "Use admin permissions to remove immediately" checkbox

[taoeffect]

Problem

To prevent groups from becoming stagnant and thereby negatively affect the distribution, we need a way to allow certain members to manage the group's members without requiring a vote. Similar to how Github allows admins to merge PRs without reviews on them by clicking a checkbox to override the review requirements, we need a checkbox on the modal for removing members that appears only for "admins". Since we don't have roles & permissions implemented yet (#202), for now this checkbox should only appear for the group creator.

Solution

For the group creator only, show a checkbox here that says Use admin permissions to remove immediately (add appropriate padding above and below the checkbox). When checked, the "Next" button transforms into "Remove", and when "Remove" is clicked, the user is immediately removed.

Please branch off of e2e-protocol and send in this PR to e2e-protocol instead of master

[taoeffect]

Closed by @SebinSong in #1786