Prepare for CI: Magnetic.FundamentalWave

[AHaumer]

Reducing the size of Reference Results
Similar procedure as #4775 and #4787 and #4788

[AHaumer]

Now I've worked on 44 examples {Electrical.Machines, Electrical.PowerConverters, Magnetic.FundamentalWave, Magnetic.QuasiStatic.FundamentalWave, Thermal.HeatTransfer} with size of ReferenceResult greater 10 MiB in 4 PRs:
#4775 #4787 #4788 #4789 (this one), reducing the size to 11.3%.
Thanks @maltelenz for updating the annotations in ModelicaTest.
I kindly ask the reviewers to inspect so we can proceed.

I'm unsure whether we could miss a regression:
@henrikt-ma @maltelenz I remember discussions about "extra spikes" in PowerConverters.
The example in MSL compares only two signals over the whole simulation time.
The example in ModelicaTest compares all signals but only over a short time window.

FYI: I'll be off for some time due to health reasons, don't know exactly when I'll be back.