[IMP] queue_job_cron: Avoid parallel run

By default, odoo never runs the same cron job in parallel. This commit uses the identity key mechanism to enforce this mechanism when a cron job is run as a queue job. This behaviour can be controlled by a new setting on the cron definition but is activated by default to keep the original behaviour

queue_job_cron/views/ir_cron_view.xml

@@ -9,7 +9,7 @@
                 <field name="run_as_queue_job" />
                 <field
                     name="no_parallel_queue_job_run"
-                    invisible="run_as_queue_job == False"
+                    invisible="not run_as_queue_job"
                 />
                 <field
                     name="channel_id"