[Fixes #14374] Add deletion of temporary files in case of rollback

[mattiagiupponi]

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[gemini-code-assist]

Code Review

This pull request extracts the temporary file removal logic into a static method __remove_temporary_file and integrates it into both the final execution step and the rollback process. The review feedback suggests adding a defensive check to prevent an AttributeError if _exec is None, and wrapping the rollback cleanup call in a try-except block to ensure that other rollback steps can proceed even if the cleanup fails.

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