Convert HAML project members view to new Vue layout that matches group
members layout

In preparation for also using that code for project members

Part of our prettier migration; changing the arrow-parens style.

Pass options to Vuex store to be used by components

Part of a larger initiative to convert the group members view from
HAML to Vue

In group members Vue app. Part of a larger initiative to convert the
group members page from HAML to Vue