CI/Circle CI: Add codestyle check

ObjectGuid::GetCounter() should not be called in logs, use ObjectGuid::ToString().c_str() instead
(cherry picked from commit af1260c40e)

contrib/check_codestyle.sh

@@ -4,7 +4,7 @@ set -e
 echo "Codestyle check script:"
 echo
 
-regexChecks=()
+regexChecks=("TC_LOG_.+GetCounter")
 
 for check in ${regexChecks[@]}; do
     echo "  Checking RegEx: '${check}'"