62X SLHC GEMGeometryBuilder cleanup

* The GEMGeometryBuilder module isduplicate in the code. The correct location is fact in GEMGeometry/GEMGeometryBuilder (not GEMGeometry/GEMGeometry)
* Extended2023HGCal does not have ME0 (https://twiki.cern.ch/twiki/bin/view/CMSPublic/SWGuideUpgradeGeom#Extended2023HGCal)

* Not included suggestion: include GEMGeometryBuilder module in Extended2023TTI 
(https://twiki.cern.ch/twiki/bin/view/CMSPublic/SWGuideUpgradeGeom#Extended2023TTI)