[Fix] Filter Active Users (#314) (#329)

Adding users to a group or setting permissions on a package now filter for active users. Also any inactive members of group/package get marked as such.

<img width="490" alt="{3B906C71-F3AE-41E4-A61C-B8377D79F685}.png" src="attachments/09cf149a-9d7a-4560-8ce7-9f3487527ee2">

Reviewed-on: enviPath/enviPy#329
Co-authored-by: Liam Brydon <lbry121@aucklanduni.ac.nz>
Co-committed-by: Liam Brydon <lbry121@aucklanduni.ac.nz>

templates/modals/objects/edit_package_permissions_modal.html

@@ -146,6 +146,7 @@
               <div class="grid grid-cols-12 gap-2 items-center">
                 <div class="col-span-5 truncate">
                   {{ up.user.username }}
+                  {% if not up.user.is_active %}<i>(inactive)</i>{% endif %}
                   <input
                     type="hidden"
                     name="grantee"