Clean up code in preparation for role details drawer refactor

...s/members/components/table/drawer/role_details_drawer.vue

...sets/javascripts/members/components/table/drawer/utils.js

...ts/javascripts/members/components/table/members_table.vue

app/assets/javascripts/members/constants.js

...rs/components/table/drawer/guest_overage_confirmation.vue

...sets/javascripts/members/components/table/drawer/utils.js

...mbers/components/table/drawer/role_details_drawer_spec.js

...ec/frontend/members/components/table/drawer/utils_spec.js

...mbers/components/table/guest_overage_confirmation_spec.js

ee/spec/frontend/members/mock_data.js

ee/spec/frontend/members/utils_spec.js

...mbers/components/table/drawer/role_details_drawer_spec.js

...end/members/components/table/drawer/role_selector_spec.js

spec/frontend/members/components/table/drawer/utils_spec.js

spec/frontend/members/components/table/members_table_spec.js

spec/frontend/members/mock_data.js

spec/frontend/members/utils_spec.js