Scorecard API response meta is broken

[jetteim]

Summary
The Datadog Go client library (github.com/DataDog/datadog-api-client-go/v2) is out of sync with the actual API response from the CreateScorecardOutcomesBatch endpoint. The API response contains a field named total_staged in the meta object, but the Go client structs still expect total_updated, as well as the API docs

Environment
Datadog Go Client Version: v2.35.0
Go Version: 1.22.0+ (toolchain go1.23.2)
API Endpoint: CreateScorecardOutcomesBatch (Scorecard v2 API)

Issue Description
When calling the CreateScorecardOutcomesBatch API through the Go client, the response JSON contains a meta object with a field named total_staged that indicates the number of services that were updated/staged. However, the Go client's response structs appear to be outdated and still reference the old field name total_updated.

Expected Behavior
The Go client should provide access to the total_staged field through its response structs, allowing developers to access this information without manual JSON parsing.

Actual Behavior
The total_staged field is not accessible through the Go client's response structs, forcing developers to manually parse the raw HTTP response body to extract this information.