Add "schedule" option in gather_test_models.py (#4397)

Summary:
Got this kind of error: https://hud.pytorch.org/pytorch/executorch/commit/11b2fcb7ba065700c2efce895c834900be242317

Pull Request resolved: #4397

Reviewed By: cccclai

Differential Revision: D60183012

Pulled By: kirklandsign

fbshipit-source-id: 8e7a55708a381922634198f4dba580474f6c4783

.ci/scripts/gather_test_models.py

@@ -56,7 +56,7 @@ def parse_args() -> Any:
         "-e",
         "--event",
         type=str,
-        choices=["pull_request", "push"],
+        choices=["pull_request", "push", "schedule"],
         required=True,
         help="GitHub CI Event. See https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#on",
     )