🌱 Refactor applier to use HelmChartLoader

[perdasilva]

Description

Refactor how helm applier gets chart by adding an extra layer of abstraction to deal with multiple bundle/fs formats (i.e. helm and registry+v1) and move feature check to main.go

Reviewer Checklist

• API Go Documentation
• Tests: Unit Tests (and E2E Tests, if appropriate)
• Comprehensive Commit Messages
• Links to related GitHub Issue(s)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.60%. Comparing base (365831a) to head (5588f6f).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2089      +/-   ##
==========================================
+ Coverage   73.49%   73.60%   +0.10%     
==========================================
  Files          78       79       +1     
  Lines        7240     7254      +14     
==========================================
+ Hits         5321     5339      +18     
+ Misses       1567     1563       -4     
  Partials      352      352              

Flag	Coverage Δ
e2e	44.12% <58.49%> (+0.31%)	⬆️
experimental-e2e	50.27% <64.15%> (+0.09%)	⬆️
unit	58.79% <73.58%> (+0.02%)	⬆️

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[joelanford]

(I know this PR is scoped to refactoring how the Helm applier gets it chart, so this is more of a follow-up we should cover....)

I don't think it makes sense for the shared/util/image package to:

1. Contain helpers that have nothing to do with OCI images (this helper reads a bundleFS to decide if it contains a chart or not; that's not related to images)
2. Contain anything related to helm (or any other bundle format at all). I imagine that this library should continue evolving to be the generic framework for turning an OCI ref into an fs.FS, where the actual implementation of that functionality is provided to the library, not part of the library.