[Investigation] Wdatp connector 403: what Defender capabilities are accessible?

## Summary

The `wdatp/alerts` endpoint returns 403 Forbidden because the connection's account is missing the Defender `ViewData` permission.

## Repro

`GET https://sdk-connector-samples.azurewebsites.net/api/wdatp/alerts`

## Error

`[wdatp] GET /api/alerts failed with status 403: {"error":{"code":"Forbidden","message":"Missing user permissions. API required permissions: ViewData, user permissions: None."}}`

## Connection

- Namespace: `sdk-test-gateway-prod` (nsUrlId: `bedc0f9f130e4bba93ea8046573db2d0`)
- Connection: `wdatp-test`

## Investigation needed

1. What Defender role/permission grants `ViewData`? (Likely requires Microsoft Defender for Endpoint P1/P2 license and Security Reader role)
2. Are there any Wdatp APIs accessible without elevated Defender permissions (e.g., machine groups, investigation packages)?
3. Can we use the Wdatp connector to demonstrate any read operation with the current connection setup?
4. Should the `wdatp-test` connection be re-created with an account that has Defender Security Reader permissions?

Start by reproducing GET /api/wdatp/alerts for the wdatp-test connection and reviewing the returned ViewData error. Investigate which Defender permission is required, check whether another Wdatp read operation works with the current connection, and document whether the connection must be recreated; done means the accessible capabilities and required setup are clear.

Rédigé par le modèle d'indexation à partir du texte de l'issue.