changes in configbuilder for autoValidation and --s VALIDATION:a+b, --s VALIDATION:a+b,c
a fix for --s VALIDATION:@A+@B:@C
Setting up the Validation Matrix
removing testing sequence
sparse checkout of TrackTriggerAssociation, SLHCUpgradeSimulations/L1TrackTrigger, DataFormats/L1TrackTrigger, RecoVertex/BeamSpotProducer
sparse checkout of SLHCUpgradeSimulations/Configuration
sparse checkout of files in SimDataFormats/SLHC
Merge Sunanda's branch.
fix
Add new L1 e/g clustering to 6_2_X_SLHC
Merge pull request #2514 from ianna/hgcal-algo

Merge Sunanda's branch
Merge pull request #2469 from deguio/autoValidation_62X_SLHC

Auto validation 62 x slhc
Merge pull request #2511 from EmanuelPerez/62X_from_Anders

Updates to L1Tracking to use the new TT objects, updates also to workflows for TP production
Merge pull request #2543 from jbsauvan/new-eg-l1-clustering_62XSLHC

Add new L1 e/g clustering to 6_2_X_SLHC