ci: remove --quiet from mkosi integration suite run

Given the integration tests take a while to run, it is useful to see
at which point it is while it is running. Sometimes only a test
script or such subset is changed, which means there's no need to
wait for the entire suite to run, especially with the sanitizers
job which is super slow.

Partially reverts 9848f56cc6

.github/workflows/mkosi.yml

@@ -308,7 +308,6 @@ jobs:
             --print-errorlogs \
             --no-stdsplit \
             --num-processes "$(($(nproc) - 1))" \
-            --quiet \
             "${MAX_LINES[@]}"
 
       - name: Archive failed test journals