Support OCI helm registry auth

[petar-cvit]

Is your feature request related to a problem? Please describe.
When fetching private templates, Cyclops injects auth data (username and password) into the request. This is supported only when fetching templates from GitHub, but not when fetching from an OCI registry.

Here is the example of how credentials are fetched from the cluster when fetching a template from GitHub and here is the function fetching data from an OCI based registry.

[pravintargaryen]

Hi @petar-cvit please review #525 as the commit for this also ended up in the same PR. Please reject (8c062f5) and I will send a separate PR

[petar-cvit]

Hey @pravintargaryen, can you close the existing PRs and create new ones with changes only for a single issue?

[pravintargaryen]

@petar-cvit please check

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