drop ecal_pn validation config back down to debug

[tomeichlersmith]

With the patching of the Tracking truth seed location, it appears like Tracking is not producing as many messages so we can hopefully drop the log level back down to debug and the log will stay below file size limit imposed by GitHub.

[tomeichlersmith]

@tvami The debug log level is still too low. The output.log file is 635M after downloading it from GitHub.

Download Link: https://github.com/LDMX-Software/ldmx-sw/actions/runs/10493665791/artifacts/1838841720
(will expire in ~30 days)

tom@zuko:~/Downloads$ unzip ecal_pn-pr-validation.zip
Archive:  ecal_pn-pr-validation.zip
  inflating: ecal_pn_recon_validation_plots.tar.gz  
tom@zuko:~/Downloads$ tar xzf ecal_pn_recon_validation_plots.tar.gz 
tom@zuko:~/Downloads$ ls -lh output.log 
-rw-r--r-- 1 tom tom 635M Aug 21 13:21 output.log

For this reason, I'm going to close this PR and keep the log level at info for the ecal_pn validation sample.

[tvami]

Thanks for doing this Tom!