Default execution name should be generated in flyteadmin

flytekit/remote/remote.py

@@ -1144,8 +1144,9 @@ def _execute(
         """
         if execution_name is not None and execution_name_prefix is not None:
             raise ValueError("Only one of execution_name and execution_name_prefix can be set, but got both set")
-        execution_name_prefix = execution_name_prefix + "-" if execution_name_prefix is not None else None
-        execution_name = execution_name or (execution_name_prefix or "f") + uuid.uuid4().hex[:19]
+        # todo: The prefix should be passed to the backend
+        if execution_name_prefix is not None:
+            execution_name = execution_name_prefix + "-" + uuid.uuid4().hex[:19]
         if not options:
             options = Options()
         if options.disable_notifications is not None:

tests/flytekit/unit/remote/test_remote.py

@@ -598,7 +598,7 @@ def test_execution_name(mock_client, mock_uuid):
         [
             mock.call(ANY, ANY, "execution-test", ANY, ANY),
             mock.call(ANY, ANY, "execution-test-" + test_uuid.hex[:19], ANY, ANY),
-            mock.call(ANY, ANY, "f" + test_uuid.hex[:19], ANY, ANY),
+            mock.call(ANY, ANY, None, ANY, ANY),
         ]
     )
     with pytest.raises(