Separate CHYT init options into makeDefault and createPublicClique

[achulkov2]

Currently, the makeDefault parameter in the CHYT spec has two meanings. First, it adds --make-default to the init script parameters, which causes the uploaded image to be marked as default for cliques. Second, it controls whether initChPublicJob is run. These effects are completely unrelated and one does not always want both of them. This PR moves the second effect under its own option createPublicClique.

[achulkov2]

I did not rename makeDefault because it would require renaming things in ytsaurus as well, which is a nuisance from a backwards compatibility perspective (operator can be used with a lot of different versions of ytsaurus images). I do agree that its name is rather ambiguous as well, maybe we should rename it (probably sometime later).