[TECH DEBT] Raise `NotFound` exception as `side_effect` in `test_install.py` unit tests

[JCZuurmond]

Currently we have raise NotFound as a side_effect in the test_install.py as follows:

ws.workspace.get_status = not_found

with:

ucx/tests/unit/install/test_install.py

Lines 98 to 100 in 2679758

	def not_found(_):
	msg = "save_config"
	raise NotFound(msg)

Solution

The following should suffice and is more correct:

ws.workspace.get_status.side_effect = NotFound

Note: Please verify if the side effect is needed at all. It might not be in all the test cases