Fix no-op for initializeObject() and isUnitializedObject() when object is not a mapped entity

[SherinBloemendaal]

Fix initializeObject() and isUnitializedObject() to be no-op for non-managed objects with native lazy objects

This fix wraps getClassMetadata() calls in try/catch blocks to handle non-entity objects gracefully while preserving functionality for valid Doctrine entities (including detached ones after clear()).

I went with the try/catch approach since isInIdentityMap() also internally calls getClassMetadata(), but I'm open to better solutions if there are any.

Changes:

• UnitOfWork::initializeObject(): Add try/catch around metadata access
• UnitOfWork::isUninitializedObject(): Add try/catch around metadata access

Fixes #12172

[github-actions]

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[greg0ire]

@stof since you introduced the comment on the interface, please review.