chore: Calls page UI improvements (#15129)

enterprise/app/finders/call_finder.rb

@@ -62,7 +62,7 @@ class CallFinder
   end
 
   def paginated_calls
-    @calls.includes(:contact, :inbox, :conversation, :accepted_by_agent)
+    @calls.includes(:contact, :conversation, :accepted_by_agent, inbox: :channel)
           .order(created_at: :desc)
           .page(@params[:page] || 1)
           .per(RESULTS_PER_PAGE)

enterprise/app/views/api/v1/models/_call.json.jbuilder

@@ -19,6 +19,8 @@ end
 json.inbox do
   json.id call.inbox_id
   json.name call.inbox.name
+  json.channel_type call.inbox.channel_type
+  json.medium call.inbox.channel.try(:medium)
 end
 
 if call.accepted_by_agent