🌱 test: Improve registry+v1 render regression test

[camilamacedo86]

Simplify and fix render regression test

• Old test made it easy to overwrite expected files via make verify.
• In all Operator Framework projects, make verify is used for codegen (go fmt, controller-gen, etc), not for regenerating testdata that should never change.
  See context
• Expected manifests should only change when renderer logic changes on purpose.

This PR:

• Moves bundles and expected output under testdata/, following Go test conventions.
• Makes it clear the ArgoCD bundle is used only for this regression test.
• Adds a proper test that runs the renderer and checks the output matches the expected YAMLs.

Safer, clearer, and avoids mistakes in reviews.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.63%. Comparing base (b5a475a) to head (8a66074).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2103      +/-   ##
==========================================
+ Coverage   73.60%   73.63%   +0.02%     
==========================================
  Files          78       78              
  Lines        7260     7260              
==========================================
+ Hits         5344     5346       +2     
+ Misses       1566     1565       -1     
+ Partials      350      349       -1     

Flag	Coverage Δ
e2e	43.72% <ø> (+0.04%)	⬆️
experimental-e2e	56.47% <ø> (+0.09%)	⬆️
unit	58.87% <ø> (-0.02%)	⬇️

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[camilamacedo86]

we do not need the readme anymore
now, the code is documented and we can clarify on it directly to simplify

[camilamacedo86]

We now have a dedicated directory for regression tests, so it's easy to add more cases in the future.
It also makes it very clear what this test does and why it's there.

[camilamacedo86]

If make verify failed in CI, most people would just run it locally and push the changes — that’s normal since verify usually runs things like go fmt, vet, and controller-gen (as in all OF projects). But it was also re-generating regression test output — which should never change or at least very unlikely change. Then:

• If that output changed because of a bug, we could accidentally miss it and merge a regression.
• It also wasn’t clear to reviewers that files in testdata/expected-manifests/ should never be edited or auto-regenerated.
• Expecting everyone to remember to check that manually is risky and easy to miss.