Change log for ZSCALER_DLP

Date Changes
2026-01-07 - Updated the field mapping for the Zscaler DLP parser.
- Please refer to the parser documentation page for information regarding the updated UDM mappings - https://docs.cloud.google.com/chronicle/docs/ingestion/default-parsers/zscaler-dlp#udm_mapping_delta
2025-05-23 - `CSV`: Added support for non-standard/invalid CSV format logs in addition to existing CSV support.
2025-04-30 - Promoted ZSCALER_DLP Premium parser to default. You can see full details in the parser configuration page - https://cloud.google.com/chronicle/docs/ingestion/default-parsers/ingest-zscaler-logs