BOM-70 (#21327)

* Update Financial Assistance logic

Use the zendesk proxy app instead of the unsupported zendesk library.

* Move to pre-fetching the group IDs.

Rather than making extra requests to zendesk to list all groups and find
a specific group ID. Just make a pre-filled list of group IDs for the
groups we care about.  When a group name is passed in, it is checked
against this list and the ticket is created in the correct group so the
right people can respond to it.

cms/envs/common.py

@@ -1844,6 +1844,10 @@ ZENDESK_USER = None
 ZENDESK_API_KEY = None
 ZENDESK_CUSTOM_FIELDS = {}
 ZENDESK_OAUTH_ACCESS_TOKEN = ''
+# A mapping of string names to Zendesk Group IDs
+# To get the IDs of your groups you can go to
+# {zendesk_url}/api/v2/groups.json
+ZENDESK_GROUP_ID_MAPPING = {}
 
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