BED-8746: migrate to app.defer

[StranDutton]

Replaces @dlt.defer with @app.defer in organization.py for the _workflow_file_contents function.

@dlt.defer functions execute lazily outside the generator iteration loop, so exceptions in them bypass the safe resource wrapper and crash the entire pipeline. @app.defer wraps them with error handling that logs the exception allows the pipeline to continue.

Depends on OpenHound PR #37

[StranDutton]

wrong branch prefix, closing because it should be patch not feature