Allow to programatically skip translation process

FYI phpunit failure on the MR seems unrelated

Open to the idea, but I'd prefer to add something to ContinuousManager instead of undocumented properties, I have no idea when we'll manage that, but I want to deprecate and remove the ability to put arbitrary stuff on content entities.

Could be a new method to set a flag and then getContinuousJobs() would just return nothing, or an explicit method to check for that.