Deploy the mailmap sync admin command

Declare a cronjob that will launch the admin command to synchronize the mailmaps between the webapp and the masking proxy database

Plan:

Staging	Production	What
Done	Done	Prepare the helm chart
Done	Done	Prepare the configuration
Done	Done	Add the permissions to the swhmailmap postgresql user
Done	Done	Deploy the new batch
Done	Done	Ensure the masking proxy is activated for all read clients
Done	Done	Stop the old mailmap sync job
?	?	Cleanup the old display name values in the person table ?
?	?	Ask for the old mailmap sync code cleanup in the webapp
TODO	TODO	Remove the old permissions of the swhmailmap postgresql user