fix codecov flakiness (#1666)

## Changes
- Codecov flakiness comes from `installer/workflows.py`, in particular
this line


https://github.com/databrickslabs/ucx/blob/9c67520c3a32e105b1acd85210cc1254a7de262a/src/databricks/labs/ucx/installer/workflows.py#L331-L333

### Tests
<!-- How is this tested? Please see the checklist below and also
describe any other relevant tests -->

- [x] manually tested
- [x] verified on staging environment (screenshot attached)

Author: nkvuong

tests/unit/test_install.py

@@ -1,5 +1,6 @@
 import io
 import json
+import logging
 from datetime import datetime, timedelta
 from unittest.mock import MagicMock, create_autospec, patch
 
@@ -301,6 +302,8 @@ def result():
     ws.jobs.wait_get_run_job_terminated_or_skipped.side_effect = OperationFailed("does not compute")
     install_state = InstallState.from_installation(mock_installation_with_jobs)
     installer = DeployedWorkflows(ws, install_state, timedelta(seconds=1))
+    logger = logging.getLogger("databricks.labs.ucx.installer.workflows")
+    logger.setLevel(logging.DEBUG)
     with pytest.raises(Unknown) as failure:
         installer.run_workflow("assessment")