Add on-call schedules endpoint (#2313)

* Fix api name

* Regenerate client from commit 7307da21 of spec repo

---------

Co-authored-by: Daniel Marin <daniel.marin@datadoghq.com>
Co-authored-by: api-clients-generation-pipeline[bot] <54105614+api-clients-generation-pipeline[bot]@users.noreply.github.com>
Co-authored-by: ci.datadog-api-spec <packages@datadoghq.com>

Author: 3 people

.apigentools-info

@@ -4,13 +4,13 @@
     "spec_versions": {
         "v1": {
             "apigentools_version": "1.6.6",
-            "regenerated": "2025-04-10 18:01:24.451821",
-            "spec_repo_commit": "c0a45137"
+            "regenerated": "2025-04-11 12:58:58.679153",
+            "spec_repo_commit": "7307da21"
         },
         "v2": {
             "apigentools_version": "1.6.6",
-            "regenerated": "2025-04-10 18:01:24.467888",
-            "spec_repo_commit": "c0a45137"
+            "regenerated": "2025-04-11 12:58:58.695743",
+            "spec_repo_commit": "7307da21"
         }
     }
 }