chore: Update the behavior of Captain resolutions (#10794)

This PR ensures that only conversations from quick conversation channels
are resolved, avoiding resolutions on the email channel (we still need
to improve the UX here). It also updates the FAQ generation logic,
limiting it to conversations that had at least one human interaction.

spec/factories/inboxes.rb

@@ -9,5 +9,10 @@ FactoryBot.define do
     after(:create) do |inbox|
       inbox.channel.save!
     end
+
+    trait :with_email do
+      channel { FactoryBot.build(:channel_email, account: account) }
+      name { 'Email Inbox' }
+    end
   end
 end