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 Collect Google Cloud Identity and Access Management context logs.