Remove legacy task order model

tests/domain/test_legacy_task_orders.py

@@ -1,28 +0,0 @@
-import pytest
-
-from atst.domain.exceptions import NotFoundError
-from atst.domain.legacy_task_orders import LegacyTaskOrders
-from atst.eda_client import MockEDAClient
-
-from tests.factories import LegacyTaskOrderFactory
-
-
-def test_can_get_task_order():
-    new_to = LegacyTaskOrderFactory.create(number="0101969F")
-    to = LegacyTaskOrders.get(new_to.number)
-
-    assert to.id == to.id
-
-
-def test_nonexistent_task_order_raises_without_client():
-    with pytest.raises(NotFoundError):
-        LegacyTaskOrders.get("some fake number")
-
-
-def test_nonexistent_task_order_raises_with_client(monkeypatch):
-    monkeypatch.setattr(
-        "atst.domain.legacy_task_orders.LegacyTaskOrders._client",
-        lambda: MockEDAClient(),
-    )
-    with pytest.raises(NotFoundError):
-        LegacyTaskOrders.get("some other fake numer")