compare-perf: Add positive/negative icons#3815

tausbn merged 3 commits intohackathon/compare-perfgithub/vscode-codeql:hackathon/compare-perffrom

tausbn/compare-perf-positive-negative-delta-iconongraphygithub/vscode-codeql:tausbn/compare-perf-positive-negative-delta-iconongraphyCopy head branch name to clipboard