Simplify failure hook by calling recover_from_failure directly

Skip unwrapping the job handler - we're already in the job instance context and respond_to? is already checked by the super method in the Delayed::Job wrapper.

Author: kathap

app/jobs/pollable_job_wrapper.rb

@@ -70,12 +70,10 @@ def error(job, exception)
       end
 
       def failure(job)
-        if @handler.respond_to?(:recover_from_failure)
-          begin
-            @handler.recover_from_failure
-          rescue StandardError => e
-            logger.error("failure recovery failed: #{e.class}: #{e.message}")
-          end
+        begin
+          recover_from_failure
+        rescue StandardError => e
+          logger.error("failure recovery failed: #{e.class}: #{e.message}")
         end
 
         change_state(job, PollableJobModel::FAILED_STATE)