Add frontend performance testing to CI
We have seen regressions for frontend performance make it through to production. We should investigate the potential for improved CI testing which can catch this earlier in the development cycle, and also prevent regressions from making it to production. While we have monitoring for frontend performance for GitLab.com, this currently requires humans to look at and catch regressions, which does not scale and is not always reliable.
We should shift this check left and automate it.