Features
- securitycenter: Added a new API method UpdateExternalSystem, which enables updating a finding w/ external system metadata. External systems are a child resource under finding, and are housed on the finding itself, and can also be filtered on in Notifications, the ListFindings and GroupFindings API (c8271d4)
- securitycenter: Added mute related APIs, proto messages and fields (3e7185c)
- securitycenter: Added resource type and display_name field to the FindingResult, and supported them in the filter for ListFindings and GroupFindings. Also added display_name to the resource which is surfaced in NotificationMessage (1f5aa78)