fix: restore global logger state after enapter.log.configure tests

The original PR introduced unit tests for `enapter.log.configure` which modified the global `LOGGER` state. This global mutation leaked across tests, causing `test_standalone/test_mqtt_adapter.py` assertions like `device_channel.publish_log.assert_called()` to fail in CI.

This commit resolves the issue by wrapping the `test_log/test_init.py` tests with an `autouse=True` fixture that takes a snapshot of the original logger's `level` and `handlers.copy()`, and restores them after the test executes. It also explicitly imports `enapter.log` instead of relying on the parent package.

Co-authored-by: rnovatorov <20299819+rnovatorov@users.noreply.github.com>

Author: google-labs-jules[bot]

tests/unit/test_log/test_init.py

@@ -1,7 +1,18 @@
 import io
 import logging
 
-import enapter
+import pytest
+
+import enapter.log
+
+
+@pytest.fixture(autouse=True)
+def reset_logger():
+    original_level = enapter.log.LOGGER.level
+    original_handlers = enapter.log.LOGGER.handlers.copy()
+    yield
+    enapter.log.LOGGER.setLevel(original_level)
+    enapter.log.LOGGER.handlers = original_handlers
 
 
 def test_configure_level_none():