Make an EaT CI

[tvami]

Is your feature request related to a problem? Please describe.

Given that EaT is getting significant attention we should have a CI that's testing it.

Describe the solution you'd like

Use the configs from Tom, as (very nicely) documented in the appendix in https://projects-docdb.fnal.gov/cgi-bin/private/RetrieveFile?docid=8252&filename=EaT_InternalNote_v3.0.3_2025_09_23.pdf&version=10

[tomeichlersmith]

The processors from the LDMX.Analaysis.eat module are from the eat branch of ldmx-analysis: https://github.com/LDMX-Software/ldmx-analysis/tree/eat

• PullNuclearEnergy is just copying the nuclear-energy simulation information from the EventHeader into its own branch for easier histogram filling in python, probably not needed
• PrimaryEcalFrontFaceKinematics uses the Ecal scoring planes to find out the kinematics of the primary electron as it enters the Ecal, probably helpful in its own right and could be copied to DQM
• HcalVetoVars is probably already implemented somewhere in Hcal, I forget why I wrote my own processor, maybe just to try out different options (like Back-only or something)