Change log for ZSCALER_FIREWALL

Date Changes
2026-01-07 - Updated the field mapping for the Zscaler Firewall 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-firewall#udm_mapping_delta
2025-09-26 Improved error handling to cover various edge cases across multiple scenarios.
2025-05-08 - Promoted ZSCALER_FIREWALL 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