Add OnCall Escalation Policy v2 endpoints (#609)

Co-authored-by: ci.datadog-api-spec <[email protected]>

Author: api-clients-generation-pipeline[bot]

.apigentools-info

@@ -4,13 +4,13 @@
     "spec_versions": {
         "v1": {
             "apigentools_version": "1.6.6",
-            "regenerated": "2025-04-15 21:54:40.699863",
-            "spec_repo_commit": "808cf2c3"
+            "regenerated": "2025-04-16 16:48:17.985349",
+            "spec_repo_commit": "eb250e74"
         },
         "v2": {
             "apigentools_version": "1.6.6",
-            "regenerated": "2025-04-15 21:54:40.715317",
-            "spec_repo_commit": "808cf2c3"
+            "regenerated": "2025-04-16 16:48:18.001246",
+            "spec_repo_commit": "eb250e74"
         }
     }
 }