23.0-cleanup-PixelCalibAlgs

Does not affect any normal workflow. This introduces a manual test to PixelCalibAlgs, the closest I can reasonably get to unit testing the package (goal of ATLASRECTS-7549 ) at present due to the long duration of the calibration algorithm and the necessity of having several root file inputs. The MR introduces an extraction script to reduce the amount of data required and reduce the running time. More controversially (comments are invited) a reference file of size 13 kb is introduced.

The purpose of the test is to ensure results invariance under future changes aimed at reducing the runtime and increasing the robustness of the Pixel Calibrations ( ATLASRECTS-7561 ).