feat(helm): add Helm OCI chart publishing

[rektide]

What this PR does / why we need it:

This is yet another draft attempt to try to add Helm OCI chart publishing, resolving #1527. This is presented for discussion primarily. It's based on assessing a variety of other K8s Helm OCI Chart implementations.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #1527.

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