CI: Run cpplint with --quiet

Instead of chopping the summary off the cpplint output, we can run it
with --quiet. This causes the summary to be suppressed, but also messages
such as "Done processing foo.cpp" which would cause the job to error out
because of adding a line to the linter output if you added a new source
file, for example.

[skip cpplint] because some messages changed.
8 jobs for 137-tweak-cpplint-rules in 41 minutes and 46 seconds (queued for 3 minutes and 56 seconds)
Status Job ID Name Coverage
  Static Analysis
passed #18583
cppcheck

00:01:56

passed #18584
cpplint

00:01:48

passed #18585
eslint

00:02:11

 
  Test
passed #18586
fedora

00:06:34

 
  Build
passed #18587
fedora_clang

00:09:51

 
  Thorough Tests
passed #18589
coverage

00:22:23

passed #18588
no_profiler

00:03:14

passed #18590
sanitizer_gcc

00:07:48