Enforces code formatting check before running tests

because it frequently gets broken in main.
(#4563)

Author: sergeibbb

tests/docker/run-unit-tests.sh

@@ -1,4 +1,8 @@
-pnpm run test;
+(
+  set -e
+  pnpm run pretty:check
+  pnpm run test
+);
 EXIT_CODE=$?;
 if [[ "$EXIT_CODE" == "0" ]]; then
   kill -s SIGINT `cat /var/run/supervisor/supervisord.pid`;