WIP: ✨ Add support for registry+v1 bundles that include webhooks

[joelanford]

Description

This PR adds support for bundles that define webhooks via:

• A new alpha feature gate called RegistryV1WebhookSupport that is disabled by default
• A new --registry-v1-cert-provider flag for the manager binary (only present when the feature gate is enabled) that allows someone installing OLMv1 to specify a certificate provider to use for registry+v1 webhooks.
• A cert-manager certificate provider
• An OpenShift Service CA certificate provider

The PR also has a small demo program (cmd/registryv1-to-helm) and some example input/output (using cloudnative-pg) that is a light wrapper around the internal/rukpak/convert library. I intend to remove all of this before the PR merges.

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

Attention: Patch coverage is 76.79372% with 207 lines in your changes missing coverage. Please review.

Project coverage is 73.54%. Comparing base (e51c0c2) to head (e2bfeef).

Files with missing lines	Patch %	Lines
internal/rukpak/convert/registryv1.go	79.67%	90 Missing and 46 partials ⚠️
cmd/registryv1-to-helm/main.go	0.00%	47 Missing ⚠️
internal/rukpak/convert/certmanager.go	89.28%	4 Missing and 5 partials ⚠️
cmd/manager/main.go	63.15%	5 Missing and 2 partials ⚠️
internal/rukpak/convert/certprovider.go	61.53%	5 Missing ⚠️
internal/applier/helm.go	40.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1506      +/-   ##
==========================================
- Coverage   74.68%   73.54%   -1.15%     
==========================================
  Files          42       46       +4     
  Lines        3271     3931     +660     
==========================================
+ Hits         2443     2891     +448     
- Misses        652      811     +159     
- Partials      176      229      +53     

Flag	Coverage Δ
e2e	48.48% <39.64%> (-3.68%)	⬇️
unit	59.06% <72.86%> (+1.07%)	⬆️

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[bentito]

So under cmd we're creating a registryv1-to-helm dir and then a cloudnative-pg dir? Isn't cloudnative-pg just a sample of an operator that requires a webhook? Shouldn't it just be in tests, or samples, or somewhere? Or even better if we didn't have all its code in our repo, but was just pulled in at test time?

[joelanford]

@bentito I intend on completely removing the cloudnative-pg stuff before we merge. That is just there as an example of the transformation that the bundle to a chart, as performed by that command.

I would probably also remove that entire registryv1-to-helm command prior to merge.