Wizard: replace local image builds with a coming-soon note (HMS-11160)

[lucasgarfield]

Local (custom) image builds aren't supported yet — on-prem image mode now shows a coming-soon empty state instead of a picker, and blocks navigation while it's selected.

• Rename "Custom images" source card to "Local images"; drop the "No login" label
• Replace the local image dropdown with a PatternFly empty state pointing at Cockpit Image Builder 10.4, with an image-builder CLI example for building local images in the meantime
• Remove the official-vs-local dropdown logic: the podman distributions query for local images, registry-auth filtering of known references, and the ImageSelect typeahead machinery only the local dropdown used
• Disable Next/Review and sidebar navigation while the local source is selected
• Resolves Remove "Custom" images (HMS-11160) #4709

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[sourcery-ai]

Hey - I've left some high level feedback:

• The canNavigate computation in CreateImageWizard now has duplicated isBaseSettingsStep checks and an extra localImageSourceSelected gate; consider simplifying this condition so the base-step and local-image constraints are expressed once and are easier to reason about.
• In LocalImageSource, the hard-coded references to Cockpit Image Builder 10.4 and the CLI example string would be easier to maintain (and potentially localize) if extracted into shared constants or a config, rather than being embedded directly in the component.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The `canNavigate` computation in `CreateImageWizard` now has duplicated `isBaseSettingsStep` checks and an extra `localImageSourceSelected` gate; consider simplifying this condition so the base-step and local-image constraints are expressed once and are easier to reason about.
- In `LocalImageSource`, the hard-coded references to Cockpit Image Builder 10.4 and the CLI example string would be easier to maintain (and potentially localize) if extracted into shared constants or a config, rather than being embedded directly in the component.

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[croissanne]

Getting rid of the mixed bootc distributions mock confused me at first, but ig it makes sense, like this is a scenario that would never happen, right?

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Scanned Files

None

[codecov]

Codecov Report

❌ Patch coverage is 85.71429% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.20%. Comparing base (9944cbe) to head (cb9ad33).

Files with missing lines	Patch %	Lines
...omponents/ImageSourceSelect/OnPrem/ImageSelect.tsx	57.14%	3 Missing ⚠️

@@            Coverage Diff             @@
##             main    #4741      +/-   ##
==========================================
+ Coverage   77.90%   78.20%   +0.30%     
==========================================
  Files         264      264              
  Lines        7069     7021      -48     
  Branches     2597     2542      -55     
==========================================
- Hits         5507     5491      -16     
+ Misses       1465     1437      -28     
+ Partials       97       93       -4     

Flag	Coverage Δ
playwright	59.07% <31.25%> (-0.87%)	⬇️
vitest	73.40% <85.71%> (+0.50%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...Components/CreateImageWizard/CreateImageWizard.tsx	84.46% <100.00%> (+0.25%)	⬆️
...reateImageWizard/components/CustomWizardFooter.tsx	70.27% <100.00%> (+14.71%)	⬆️
...mageOutput/components/ImageSourceSelect/Hosted.tsx	95.91% <100.00%> (ø)
.../components/ImageSourceSelect/ImageSourceError.tsx	100.00% <100.00%> (ø)
...ents/ImageSourceSelect/OnPrem/LocalImageSource.tsx	100.00% <100.00%> (ø)
...tput/components/ImageSourceSelect/OnPrem/index.tsx	75.00% <100.00%> (+25.00%)	⬆️
...omponents/ImageSourceSelect/OnPrem/ImageSelect.tsx	60.86% <57.14%> (-1.14%)	⬇️

... and 17 files with indirect coverage changes

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[lucasgarfield]

Getting rid of the mixed bootc distributions mock confused me at first, but ig it makes sense, like this is a scenario that would never happen, right?

Exactly - we're only going to be supporting RHEL, and even then we're only supporting a small set of images (the ones available on catalog.redhat.com for kvm, aws, iso, and the base container to use as the iso payload).

[lucasgarfield]

Replaced by #4756 - was approved but CI failing so will just let #4756 get in instead.