Ecal ACTS with guns

[tvami]

Issue description

For now I tested the ECAL ACTS with signal, but we should just do it first with an electron gun
https://github.com/LDMX-Software/ldmx-sw/blob/trunk/.github/validation_samples/eat_signal/config.py#L47

Tasks

• Do a systematics study with an electron gun where you shoot an electron in a given angle and energy
• And then study what the algo measures for the angle and the energy
• Practically:

So take the electron gun config add the

ecal_tracking = ecal_vetos.EcalTrackFinderProcessor()

also in the sequence
https://github.com/LDMX-Software/ldmx-sw/blob/trunk/.github/validation_samples/eat_signal/config.py#L91

and then add the DQMs that will make the plots
https://github.com/LDMX-Software/ldmx-sw/blob/trunk/.github/validation_samples/eat_signal/config.py#L102-L103

Existing material to start off

• Source 1
• Source 1