🌱 switch back to use of trusted CA, add extra test for mirror registry

[joelanford]

This PR is intended to (partially) resolve issues around the complexity of implementing an e2e test that proves /etc/containers/registries.conf is honored.

It:

• puts everything back to a registry with a trusted cert across the board
• changes registries.conf in the standard e2e to map from a "mirrored-registry" to "docker-registry"
• adds a new package in the shared catalog called "prometheus-mirrored" whose bundle ref uses the "mirror-registry" domain
• updates the ClusterExtensionInstallRegistry e2e test to verify installs of both "prometheus" and the new "prometheus-mirrored" package (the latter would fail without the mapping config)

Description

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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[joelanford]

Note to reviewers: review this with whitespace ignored. Most of the diff here is an indent of the original test code (just with templated package name).

[tmshort]

There's a blank line issue, though.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.47%. Comparing base (f0c761d) to head (8220aec).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1274      +/-   ##
==========================================
- Coverage   76.51%   76.47%   -0.05%     
==========================================
  Files          40       40              
  Lines        2363     2363              
==========================================
- Hits         1808     1807       -1     
- Misses        389      390       +1     
  Partials      166      166              

Flag	Coverage Δ
e2e	57.85% <ø> (ø)
unit	52.89% <ø> (-0.17%)	⬇️

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[tmshort]

Fix the lint, and I ought to be able to give it an LGTM. Looks like an undo and a test mod, as described.

[tmshort]

/lgtm