feat: enable Dialogflow integration all inboxes except email (#3285)

Fixes #2461

Co-authored-by: Sojan Jose <sojan@pepalo.com>

spec/models/conversation_spec.rb

@@ -407,7 +407,8 @@ RSpec.describe Conversation, type: :model do
   end
 
   describe '#botintegration: when conversation created in inbox with dialogflow integration' do
-    let(:hook) { create(:integrations_hook, :dialogflow) }
+    let(:inbox) { create(:inbox) }
+    let(:hook) { create(:integrations_hook, :dialogflow, inbox: inbox) }
     let(:conversation) { create(:conversation, inbox: hook.inbox) }
 
     it 'returns conversation status as pending' do