Fix up templates for application team table:

- add permission check for link to add member to an environment
- import missing macros in read-only version of member table

templates/fragments/applications/read_only_team.html

@@ -1,3 +1,5 @@
+{% from "components/toggle_list.html" import ToggleButton, ToggleSection %}
+
 {% for member in team_form.members %}
   {% set user_permissions = [member.permission_sets.perms_team_mgmt, member.permission_sets.perms_env_mgmt, member.permission_sets.perms_del_env] %}