Disable pylint unreachable code warnings in tests

The warnings are triggered by the use of hypothesis.assume()
to filter out invalid test cases, which can lead to code paths
that are not executed in some test runs. And they have been
disabled as the logic is correct.

Signed-off-by: Daniel Zullo <daniel.zullo@frequenz.com>

Author: daniel-zullo-frequenz

tests/test_quantities.py

@@ -801,7 +801,7 @@ def test_quantity_divided_by_float(
 ) -> None:
     """Test the division of all quantities by a float."""
     hypothesis.assume(scalar != 0.0)
-    quantity = quantity_ctor(quantity_value)
+    quantity = quantity_ctor(quantity_value)  # pylint: disable=unreachable
     expected_value = quantity.base_value / scalar
     print(f"{quantity=}, {expected_value=}")
 
@@ -837,7 +837,9 @@ def test_quantity_divided_by_self(
     """Test the division of all quantities by a float."""
     hypothesis.assume(divisor_value != 0.0)
     # We need to have float here because quantity /= divisor will return a float
-    quantity: Quantity | float = quantity_ctor(quantity_value)
+    quantity: Quantity | float = quantity_ctor(  # pylint: disable=unreachable
+        quantity_value
+    )
     divisor = quantity_ctor(divisor_value)
     assert isinstance(quantity, Quantity)
     expected_value = quantity.base_value / divisor.base_value