Parsoid: clean up the manifests and files
There are a lot of unused Parsoid roles and files after the transition
to service::node. This patch cleans them up.
Note that the transition_cleanup role is being removed too, since the
transition is complete and the role has been applied to all of the wtp*
hosts.
Bug: T90668
Change-Id: I7b3c4167d6e447e40b931c69b14eea9b1a80bbe6