Remove deadcode for RubyLsp::Rails::NullClient::connected?

Author: shopify-codedb[bot]

lib/ruby_lsp/ruby_lsp_rails/runner_client.rb

@@ -403,11 +403,6 @@ def rails_root
         Dir.pwd
       end
 
-      sig { returns(T::Boolean) }
-      def connected?
-        false
-      end
-
       private
 
       sig { params(message: ::String, type: ::Integer).void }