Change log for GCP_IAM_CONTEXT

Date Changes
2024-03-13 - Additionally mapped resource.data.email to entity.user.userid.
- Updated mappings of raw logs, resource.data.oauth2ClientId to entity.user.attribute.labels and resource.data.uniqueId to entity.user.product_object_id UDM fields.
2023-07-26 Promoted GCP_IAM_CONTEXT parser to default.
For the field mapping reference, see https://cloud.google.com/chronicle/docs/ingestion/cloud/context-parsers>Collect Google Cloud Identity and Access Management context logs.