ModelicaTest.Electrical.QuasiStatic.*.FrequencySweep is missing experiment annotation

[maltelenz]

The models:

ModelicaTest.Electrical.QuasiStatic.Polyphase.FrequencySweep
ModelicaTest.Electrical.QuasiStatic.SinglePhase.FrequencySweep

are missing an experiment annotation, assuming they are meant to be tested.

[casella]

I checked

• https://github.com/modelica/MAP-LIB_ReferenceResults/blob/v4.1.0/ModelicaTest/Electrical/QuasiStatic/SinglePhase/FrequencySweep/FrequencySweep.csv
• https://github.com/modelica/MAP-LIB_ReferenceResults/blob/v4.1.0/ModelicaTest/Electrical/QuasiStatic/Polyphase/FrequencySweep/FrequencySweep.csv

Both files contents are consistent with StopTime = 1.0 and Interval = 0.0002.

Should be fixed by #4516, which adds the annotations accordingly.