Mqtt prepare test base part1 (#89796)

* Refactor test_reloadable

* Refactor test_disabling_and_enabling_entry

* optimize test_unload_config_entry

* Cleanup help_test_unload_config_entry

* cleanup test_unload_entry

* Update test tls_version

* More tests to entry only

* Add validate and hassconfig patch

* Revert fixture changes patch_hass_config

* Follow up comments

tests/components/mqtt/conftest.py

@@ -1,3 +1,11 @@
 """Test fixtures for mqtt component."""
+
+import pytest
+
 from tests.components.blueprint.conftest import stub_blueprint_populate  # noqa: F401
 from tests.components.light.conftest import mock_light_profiles  # noqa: F401
+
+
+@pytest.fixture(autouse=True)
+def patch_hass_config(mock_hass_config: None) -> None:
+    """Patch configuration].yaml."""