Merge tests which are essentially repeated.

[lmdiazangulo]

There are several tests which seem to be essentially repeated except for a single item. Some examples:

fdtd/test/pyWrapper/test_full_system.py

Line 8 in bae92bc

def test_lineIntegralProbe_single_wire(tmp_path):

fdtd/test/pyWrapper/test_full_system.py

Line 20 in bae92bc

def test_lineIntegralProbe_wire(tmp_path):

and

fdtd/test/pyWrapper/test_full_system.py

Line 915 in bae92bc

def test_nodal_source_wire(tmp_path):

fdtd/test/pyWrapper/test_full_system.py

Line 946 in bae92bc

def test_nodal_source_unshielded(tmp_path):