Hmm, in `2.99` we'll need to deprecate, in `3.x` I'm not sure how we handle this, because it will be the go to use case, so we don't want a warning or deprecation every time...

In a seperate PR I'd like to see the deprecation issued as `RSpec.deprecate '--seed no longer sets order to random', :replacement => '--order rand:SEED', :call_site => nil`

@myronmarston do you think we should issue a warning here at all for `3.x`? Is it sufficient to deprecate in `2.99`?