Runtime: change error log to debug

[k-anshul]

Here is my hypothesis around how detach can fail even in happy scenarios:

1. The db file is created and we start ingesting data.
2. The ingestion fails due to n number of reasons like duckdb memory limit exhausted, cancellation etc.
3. In the cleanup we reopen db which re-attaches all files and removes directory with a db file but no version.txt file.
4. Now the detach in cleanup will complain that db file does not exist.