Fix test beam conditions problem

Carl found that the Tracker digitization algorithm crashes when run on simulated test beam data. This was caused by re-use of the FASER+IFT conditions for the test beam detector. It is OK for the geometry (most common usage) but it does not work for the place-holder gain/noise constants.

It was necessary to create a new conditions tag for the test beam: OFLCOND-FASER-TB00. This should be used with the FASER-TB00 geometry tag. If your code worked with the old combination (FASER-TB00 + OFLCOND-FASER-02) it should still work, but it would be best to move to the new, more robust setup.