cubicweb #13886467 Provide a command to synchronize all sources [validation pending]

In WSGI mode we need to replace the looping task created by UpdateFeedsStartupHook by a command (that could run in a cron job for instance)

prioritynormal
typeenhancement
done in3.23.0
load left0.000
closed by#47b0b08fbb4b [serverctl] allow to sync multiple and all sources in source-sync command
patch[serverctl] allow to sync multiple and all sources in source-sync command [applied][serverctl] allow to synchronize all sources in source-sync command [folded]