chore(evals): add security-alert-triage to weekly LLM eval schedule

Registers the suite alongside the other security evals so it runs
automatically in the weekly pipeline against the core model matrix.

Refs #17496

Author: jonwalstedt

.buildkite/pipelines/evals/llm_evals.yml

@@ -398,3 +398,25 @@ steps:
           automatic:
             - exit_status: '-1'
               limit: 3
+
+      - label: 'Evals: Security Alert Triage'
+        key: kbn-evals-weekly-security-alert-triage
+        command: bash .buildkite/scripts/steps/evals/run_suite.sh
+        env:
+          KBN_EVALS: '1'
+          FTR_EIS_CCM: '1'
+          EVAL_SUITE_ID: 'security-alert-triage'
+          EVAL_FANOUT: '1'
+          EVAL_INCLUDE_EIS_MODELS: '1'
+          EVAL_MODEL_GROUPS: *weekly_eis_core_models
+        timeout_in_minutes: 60
+        agents:
+          image: family/kibana-ubuntu-2404
+          imageProject: elastic-images-prod
+          provider: gcp
+          machineType: n2-standard-8
+          preemptible: true
+        retry:
+          automatic:
+            - exit_status: '-1'
+              limit: 3