I'm going to start adding generators for things like text soon, so it
makes sense to specifically sequester level generators as their own
thing
Change-Id: I175025375204fab7d75eba67dd06dab9bd2939d3
Reviewed-on: https://cl.tvl.fyi/c/depot/+/3201
Reviewed-by: grfn <grfn@gws.fyi>
Tested-by: BuildkiteCI