CBG-4096: add mandatory fields to AuditIDChangesFeedStarted event

[gregns1]

CBG-4096

• Missing mandatory fields added

{"cid":"#001","db":"db1","description":"Changes feed was started","feed_type":"normal","id":54200,"ks":"db1._default._default","local":{"ip":"127.0.0.1","port":"4985"},"name":"Changes feed started","real_userid":{"domain":"cbs","user":"couchbase"},"remote":{"ip":"127.0.0.1","port":"55965"},"since":"0","timestamp":"2024-07-23T15:21:01.242867+01:00"}

Pre-review checklist

• Removed debug logging (fmt.Print, log.Print, ...)
• Logging sensitive data? Make sure it's tagged (e.g. base.UD(docID), base.MD(dbName))
• Updated relevant information in the API specifications (such as endpoint descriptions, schemas, ...) in docs/api

Integration Tests

• GSI=true,xattrs=true https://jenkins.sgwdev.com/job/SyncGateway-Integration/000/