box: move all box.ctl triggers except for on_shutdown

The patch moves all triggers from box.ctl to module trigger instead of
on_shutdown trigger - they are run in separate fibers, which makes it more
difficult to move it to the event subsystem, so it will be moved there
in a separate commit.

Also, box_raft_on_broadcast triggers are renamed to box_raft_on_election.
Despite they are fired on broadcast, the only place they are installed
along the whole tarantool organization is box.ctl.on_election.

NO_DOC=later
NO_CHANGELOG=later

Part of #8657