Refactor add_member to use search_and_select
What does this MR do?
Page::Project::Settings::Members#add_member
would previously call Page::Component::UsersSelect.select_user
which has a redundant implementation of the select2 component.
This change instead utilizes Page::Component::Select2.search_and_select
which has a built-in waiting for the search to be complete before continuing.
Rel: #212185 (closed)