Draft: Replace yarn with pnpm
What does this MR do and why?
Yarn 1.x, our JavaScript package manager, is no longer supported and is starting to cause some issues when we update frontend dependencies (e.g, gitlab-org/frontend/renovate-gitlab-bot!733 (merged) / https://github.com/isaacs/node-glob/issues/563#issuecomment-1748292145).
This MR replaces yarn with pnpm. I'm trying pnpm here because:
- it builds faster than
npm(~8 seconds vs ~30 seconds for our project, installing without cache on my laptop) - it can be managed with
asdf, and yarn 2.x+ cannot (https://github.com/twuni/asdf-yarn#looking-for-yarn-v2) - big projects like VueJS and Vite use it
This is still a draft, still have some testing to do. Won't work on CI yet since pnpm is not available in our container images (that will need to happen in a separate MR that we merge first).
Closes #1703 (closed)
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