Calibrate only selected pixel measurements during acts track finding.
requested to merge goetz/athena:main_during_acts_track_finding_apply_pixel_calibration_after_measurement_selection into main
Since the calibration is expensive this saves a considerable amount of CPU.
This change slightly impacts the pixel measurement selection, since the chi2 used to select and sort the measurements is computed from uncalibrated pixel measurements. The chi2 is re-computed for selected measurements, but the selection and order is not updated. The impact is at the per mil level.