QL: Merge pull request #124 from github/erik-krogh/fix-step-performance
QL: Merge pull request #124 from github/erik-krogh/fix-step-performance

fix performance of the transitive step query
github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql,github/codeql