chore(cleanup): Delete sentiment feature (#9304)

- The feature is unused, removing it for now, will bring it back with better models later.

spec/enterprise/models/message_spec.rb

@@ -1,20 +0,0 @@
-# frozen_string_literal: true
-
-require 'rails_helper'
-require Rails.root.join 'spec/models/concerns/liquidable_shared.rb'
-
-RSpec.describe Message do
-  context 'with sentiment analysis' do
-    let(:message) { build(:message, message_type: :incoming, content_type: nil, account: create(:account)) }
-
-    it 'calls SentimentAnalysisJob' do
-      with_modified_env SENTIMENT_FILE_PATH: 'sentiment-analysis.onnx' do
-        allow(Enterprise::SentimentAnalysisJob).to receive(:perform_later).and_return(:perform_later).with(message)
-
-        message.save!
-
-        expect(Enterprise::SentimentAnalysisJob).to have_received(:perform_later)
-      end
-    end
-  end
-end