Remove MFGeometry_120812 and MFGeometry_130503

[tvami]

these both run from run number 1 and are superseded by MFGeometry_160812 and MFGeometry_90322 (these numbers are FEM version numbers)
In principle could be removed from all new tags in autoCond + online tags as well
HN link: https://hypernews.cern.ch/HyperNews/CMS/get/calibrations/4450.html

[tvami]

I have this gDoc to document the changes
https://docs.google.com/spreadsheets/d/1j-6BbNclMzs9hJ28jJJlOsLaozEN5bU4Acs1oTUQs28/edit#gid=0

[tvami]

Resolved in cms-sw/cmssw#35363