feat: Please add CLI/Client support for testFindingsRefinement

[ared1u]

This API endpoint is used to test new exclusions without deploying them first to SecOps.
I tried calling it directly, but I keep getting a 400 INVALID_ARGUMENT error.

{
  "type": "DETECTION_EXCLUSION",
  "query": "...",
  "interval": {
    "startTime": "2026-01-29T15:28:13.975619Z",
    "endTime": "2026-04-29T15:28:13.975619Z"
  },
  "detectionExclusionApplication": {
    "curatedRules": [
      "projects/.../locations/eu/instances/.../curatedRules/ur_UUID"
    ]
  }
}

Thanks! 😁