Allow user to specify curated packageBundle version during cluster install

[anashakt]

What would you like to be added:
Currently versioning of curated package bundle is not allowed because of by default latest curated package bundle gets activated on the cluster. I would like to have a key in the cluster spec using which one can specify a packagebundle version.

Why is this needed:
It allows controlled release of packages in production. If QA team has tested EKSA cluster lifecycle against a specific packageBundle version then production should get the same version as opposed to latest available at the time of cluster creation in Production.

[tatlat]

Thanks for bringing this up! We will add it to the backlog for now and discuss priority internally.