updated TTI customization: keep only the signal TrackingParticles; add c...

[EmanuelPerez]

• updated customise_Digi_TTI in SLHCUpgradeSimulations/Configuration/python/combinedCustoms_TTI.py: keep only TrackingParticles from the main interaction
• minor update of l1EventContent_TTI and addition of a l1EventContent_TTI_forHLT, the latter may be used if we need to produce samples that may be used for HLT CPU studies
• added a cust_2023TTI_forHLT in combinedCustoms.py, which is the same as the default cust_2023TTI except that we call the "forHLT" event content

[cmsbuild]

A new Pull Request was created by @EmanuelPerez for CMSSW_6_2_X_SLHC.

updated TTI customization: keep only the signal TrackingParticles; add c...

It involves the following packages:

SLHCUpgradeSimulations/Configuration

@cmsbuild, @civanch, @Degano, @mdhildreth, @nclopezo can you please review it and eventually sign? Thanks.
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@andersonjacob, @mark-grimes you are the release manager for this.
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[andersonjacob]

merge

tests pass that normally pass.