revert: "fix: html content is available and mail_part empty" (#3986)

Reverts de4e4c6

spec/mailboxes/support_mailbox_spec.rb

@@ -157,29 +157,6 @@ RSpec.describe SupportMailbox, type: :mailbox do
       end
     end
 
-    describe 'when mail part is not present' do
-      let(:support_mail) { create_inbound_email_from_fixture('support_1.eml') }
-      let(:described_subject) { described_class.receive support_mail }
-
-      it 'Considers raw html mail body' do
-        described_subject
-        expect(conversation.inbox.id).to eq(channel_email.inbox.id)
-        expect(conversation.messages.last.content).to include(
-          <<-BODY.strip_heredoc.chomp
-            Hi,
-            We are providing you platform from here you can sellpaid posts on your website.
-
-            Chatwoot | CS team | [C](https://d33wubrfki0l68.cloudfront.net/973467c532160fd8b940300a43fa85fa2d060307/dc9a0/static/brand-73f58cdefae282ae74cebfa74c1d7003.svg)
-
-            Skype: live:.cid.something
-
-            []
-          BODY
-        )
-        expect(conversation.messages.last.content_attributes['email']['subject']).to eq('Get Paid to post an article')
-      end
-    end
-
     describe 'Sender with reply_to email address' do
       let(:reply_to_mail) { create_inbound_email_from_fixture('reply_to.eml') }
       let(:email_channel) { create(:channel_email, email: 'test@example.com', account: account) }