Add retry_jitter to 6.1 new framework defaults

This was added to the defaults for new applications in
e2cdffce3d, but we also need an entry in
the new framework defaults initializer for upgrading applications.

railties/lib/rails/application/configuration.rb

@@ -159,10 +159,6 @@ module Rails
         when "6.1"
           load_defaults "6.0"
 
-          if respond_to?(:active_job)
-            active_job.retry_jitter = 0.15
-          end
-
           if respond_to?(:active_record)
             active_record.has_many_inversing = true
           end
@@ -172,6 +168,7 @@ module Rails
           end
 
           if respond_to?(:active_job)
+            active_job.retry_jitter = 0.15
             active_job.skip_after_callbacks_if_terminated = true
           end
 

railties/lib/rails/generators/rails/app/templates/config/initializers/new_framework_defaults_6_1.rb.tt

@@ -12,6 +12,9 @@
 # Track Active Storage variants in the database.
 # Rails.application.config.active_storage.track_variants = true
 
+# Apply random variation to the delay when retrying failed jobs.
+# Rails.application.config.active_job.retry_jitter = 0.15
+
 # Stop executing `after_enqueue`/`after_perform` callbacks if
 # `before_enqueue`/`before_perform` respectively halts with `throw :abort`.
 # Rails.application.config.active_job.skip_after_callbacks_if_terminated = true