fix: skip incomplete nested objects during duplication

[superdav42]

Summary

• preserve nested __PHP_Incomplete_Class values that appear after serialized arrays/objects are unserialized during duplication
• extend the incomplete-object regression to cover nested object payloads while still rewriting scalar URLs in the same payload

Why

• production checkout still aborted after PR fix: preserve incomplete objects during duplication #1419 because the missing Yoast object was nested inside an unserialized payload and hit the generic object mutation branch
• this keeps checkout provisioning from aborting after tenant DB creation but before pending-site cleanup and blogmeta assignment

Verification

• php -l inc/duplication/data.php
• php -l tests/WP_Ultimo/Duplication/MUCD_Data_Test.php
• WP-CLI probe: warnings=0 old=yes new=yes for nested incomplete object payload
• git diff --check

Notes

• vendor/bin/phpunit --filter MUCD_Data_Test remains blocked locally by missing /tmp/wordpress-tests-lib/includes/functions.php

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: b29abfbd-57d0-4f89-8aa8-ba8799261583

📥 Commits

Reviewing files that changed from the base of the PR and between b730746 and d6341fa.

📒 Files selected for processing (2)

• inc/duplication/data.php
• tests/WP_Ultimo/Duplication/MUCD_Data_Test.php

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/checkout-nested-incomplete-object

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[github-actions]

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