Reduce test tolerances to much tighter values
Changed from loose tolerances (30 degrees for phase, 5 dB for power) to much tighter ones:
- Phase: atol=0.1 degrees, rtol=0.5 (50% for small values)
- Power: atol=0.1 dB, rtol=0.04 (4%)
These tighter tolerances use a combination of small absolute and relative tolerances to properly validate the EM field computation accuracy while accounting for both small and large values.
Co-authored-by: jeertmans <27275099+jeertmans@users.noreply.github.com>