counters: Configure staging and webapp1 to use swh-counters

• Move the swh-counters's history configuration to a top level configuration as it need to be deployed on all the environments
• Configure staging's webapp and webapp1.production to use swh-counters as the source of the counters
• Add a history file resulting of the merge of the old history-counters-munin.json and prometheus data issued from the sql_swh_archive_object_count collection until 2021-04-15
• Schedule the regularly refresh of the history file in production. it will be initially used by webapp1 only

Related to T3250