erp5_wendelin_telecom_ingestion: minor fix in pending file metadata and logging references besides ids

- corresponding refactoring in check references, handle split, etc
- new permissions for contributor (delete)

- fix in ingestion ref exists handling restarted split ingestions

- ingestion reference now receives size and hash of file

- new script to handle planned ingestions
- unit test refactoring
- improvement of some queries
- better handling of empty ingested files
- more cleanup of logs

- some cleanup in logs
- some try catch for better error log

This reverts commit 818bc0f5.