Remove legacy source provider sync path

tests/test_legacy_dns_engine.py

@@ -1,54 +0,0 @@
-import unittest
-
-from dns_sync.engine import build_sync_plan
-from dns_sync.models import (
-    DesiredRecord,
-    ProviderCapabilities,
-    ProviderRecord,
-)
-
-
-class LegacyDnsEngineTests(unittest.TestCase):
-    def test_existing_dns_plan_still_adds_updates_and_preserves_matches(self):
-        desired = {
-            "add.example.com": DesiredRecord(
-                hostname="add.example.com",
-                ip="192.168.1.101",
-            ),
-            "keep.example.com": DesiredRecord(
-                hostname="keep.example.com",
-                ip="192.168.1.101",
-            ),
-            "update.example.com": DesiredRecord(
-                hostname="update.example.com",
-                ip="192.168.1.101",
-            ),
-        }
-        current = {
-            "keep.example.com": ProviderRecord(
-                hostname="keep.example.com",
-                ip="192.168.1.101",
-            ),
-            "update.example.com": ProviderRecord(
-                hostname="update.example.com",
-                ip="192.168.1.50",
-            ),
-        }
-
-        plan = build_sync_plan(
-            desired,
-            current,
-            ProviderCapabilities(),
-        )
-
-        actions = {
-            item.desired.hostname: item.action
-            for item in plan
-        }
-        self.assertEqual(actions["add.example.com"], "ADD")
-        self.assertEqual(actions["keep.example.com"], "UNCHANGED")
-        self.assertEqual(actions["update.example.com"], "UPDATE")
-
-
-if __name__ == "__main__":
-    unittest.main()