fix!: play nicer with helm

[krancour]

Fixes #1281

May partially address #1280, although some aspects of that issue are strictly UI-related.

Supersedes #1294

Draft because I am still working out some kinks.

Summary

With respect to Helm charts, the term "registry" has proven intuitive to people very familiar with OCI registries, but much more befuddling to those who are more familiar with classic (https/s-based) chart repositories. Confusion is compounded by Argo CD and Helm itself (e.g. in dependencies section of a chart.yaml file) continuing to exclusively use the classic repository parlance.

This PR implements a strategy refined through extensive discussion in #1294 and strikes "registry" from the Kargo vernacular.

• When subscribing a warehouse to a chart repo you:

  • Use URL + name for classic repos. (Classic repos can contain differently named charts, so the name field provides necessary qualification.)
  • Use URL only for oci repos. (OCI repo URLs imply the chart's name.)

• When defining promotion mechanisms:

  • Updates to a chart.yaml simply require you to match repository and name fields exactly as they appear in the chart.yaml. Kargo will figure out the rest.
  • Updates to an Application source require you to match the repoURL and chart fields exactly as they appear in the Application source.

Incidentally, this PR also changes some function names that contained the phrase "getLatestChart" to "selectChart." "Latest" implies something that isn't necessarily true since chart selection can be constrained with semver constraints.

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[codecov]

Codecov Report

Attention: 38 lines in your changes are missing coverage. Please review.

Comparison is base (397fc3e) 48.77% compared to head (39c178f) 48.84%.

Files	Patch %	Lines
internal/helm/helm.go	28.57%	14 Missing and 1 partial ⚠️
internal/controller/warehouses/helm.go	55.17%	11 Missing and 2 partials ⚠️
internal/controller/stages/health.go	53.33%	5 Missing and 2 partials ⚠️
internal/api/query_freights_v1alpha1.go	71.42%	2 Missing ⚠️
internal/controller/promotion/argocd.go	85.71%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1450      +/-   ##
==========================================
+ Coverage   48.77%   48.84%   +0.06%     
==========================================
  Files         131      131              
  Lines       12026    12087      +61     
==========================================
+ Hits         5866     5904      +38     
- Misses       5959     5978      +19     
- Partials      201      205       +4     

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[jessesuen]

Great improvement