Do not run tests on CI in stage 0

Author: Kobzol

src/ci/docker/host-x86_64/tidy/Dockerfile

@@ -44,5 +44,5 @@ RUN bash -c 'npm install -g eslint@$(cat /tmp/eslint.version)'
 
 # NOTE: intentionally uses python2 for x.py so we can test it still works.
 # validate-toolstate only runs in our CI, so it's ok for it to only support python3.
-ENV SCRIPT TIDY_PRINT_DIFF=1 python2.7 ../x.py test --stage 0 \
+ENV SCRIPT TIDY_PRINT_DIFF=1 python2.7 ../x.py test \
   src/tools/tidy tidyselftest --extra-checks=py,cpp,js,spellcheck