Close #5325 fix config_readonly for Quickstart 3.2.x

[trackleft]

Description

Fixes a WSOD caused by config_readonly when accessing certain configuration forms (notably XML Sitemap bundle settings) while using a staged configuration workflow.

Quickstart sites using config staging hit an error due to TranslatableMarkup being treated as an array inside ReadOnlyFormSubscriber::getConfigTargetNames(). This PR adds the static patch from the upstream Drupal.org issue so Quickstart users are not blocked.

The patch is included as a static file rather than referencing a dynamic diff URL so the contents remain fixed and reviewable.

Release notes

• Fix WSOD on some admin configuration forms when config_readonly is enabled.
• Applies upstream patch for config_readonly compatibility with newer form structures.

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Related issues

• Closes config_readonly module errors out when attempting to change sitemap settings. #5325
• Upstream: https://www.drupal.org/project/config_readonly/issues/3469854

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How to test

1. Ensure config_readonly is enabled.
2. Use a site with config staging enabled.
3. Go to:
   /admin/config/search/xmlsitemap/settings/node/az_event
4. Before this change: WSOD + log error.
5. After this change: form loads normally.

Optional regression checks:

• Visit other config forms to confirm no new readonly regressions.
• Run drush cr and confirm no PHP warnings.

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Types of changes

Arizona Quickstart (install profile, custom modules, custom theme)

• Patch release changes
  • Bug fix

Drupal contrib projects

• Patch release changes
  • Patch or minor level update

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Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.
• My change requires release notes.

[joeparsons]

Patch looks OK to me. Seems like the problem might affect any form that uses config_target (?)