tracking.singleaxis takes apparent_azimuth

[AdamRJensen]

The pvlib.tracking.singleaxis takes input parameters of apparent_zenith and apparent_azimuth. Since the solar azimuth angle is not affected by refraction, this parameter name does not make sense. It is the only place in pvlib that apparent_azimuth is used.

pvlib-python/pvlib/tracking.py

Lines 9 to 11 in a27c686

	def singleaxis(apparent_zenith, apparent_azimuth,
	axis_tilt=0, axis_azimuth=0, max_angle=90,
	backtrack=True, gcr=2.0/7.0, cross_axis_tilt=0):

This discussion is related to #1403.

A number of attendees at the 2025 PVSC pvlib tutorial had issues finding the apparent_azimuth parameter (for good reason), hence I think the inputs should be changed to solar_, which would also be consistent with most other pvlib functions (even when they require apparent solar angles).