Updates CI to check that the Kontrol summary dummy files are not
modified by any PR unless the change is deliberate. Committed files
are dummy files and aren't meant to change.

Alternative here would be to generate the dummy files with a
script that gets triggered before forge builds stuff. Main concern
with using an autogen script is that the script would need to be
added in front of build commands all over the place. Committing
the files and checking that they aren't changed is slightly more
janky but people rarely re-generate these files anyway so the
projected impact is minimal.

If this becomes a devx hassle we can consider autogen.