tropo_pyaps3: bugfix for hyp3 product

[yunjunz]

Description of proposed changes

• tropo_pyaps3: bugfix for hyp3 products in UTM coordinates:

  • calc_delay_timeseries(): remove the call of ut.to_latlon() while preparing the pixel-wised 2D lat/lon matrices, as ut.get_lat_lon() handled the UTM/latlon conversion already since #1052

• replace ut.to_latlon() with ut.utm2latlon() as the latter also support non-gdal files, in the following occurrences:

  • tropo_pyaps3.get_bounding_box()
  • utils.utils.prepare_geo_los_geometry()

• utils.utils0.get_lat_lon(): print out UTM/latlon conversion message, to help future tracking/diagnose

• prep_hyp3: convert UTM to lat/lon for LAT/LON_REF1/2/3/4

Reminders

• [x] Pass Pre-commit check (green)
• [x] Pass Codacy code review (green)
• [x] Pass Circle CI test (green)
• [x] If modifying functionality, describe changes to function behavior and arguments in a comment below the function declaration.