Remove discovery config validation from supervisor (#4937)

* Remove discovery config validation from supervisor

* Remove invalid test

* Change validation to require a dictionary for compatibility

tests/addons/test_config.py

@@ -1,7 +1,5 @@
 """Validate Add-on configs."""
 
-import logging
-from unittest.mock import Mock
 
 import pytest
 import voluptuous as vol
@@ -288,14 +286,3 @@ def test_valid_slug():
     config["slug"] = "complemento telefónico"
     with pytest.raises(vol.Invalid):
         assert vd.SCHEMA_ADDON_CONFIG(config)
-
-
-def test_invalid_discovery(capture_event: Mock, caplog: pytest.LogCaptureFixture):
-    """Test invalid discovery."""
-    config = load_json_fixture("basic-addon-config.json")
-    config["discovery"] = ["mqtt", "junk", "junk2"]
-
-    assert vd.SCHEMA_ADDON_CONFIG(config)
-
-    with caplog.at_level(logging.WARNING):
-        assert "unknown services for discovery: junk, junk2" in caplog.text