Revert "ci: run Linux Playwright jobs in prebuilt Microsoft container (#93794)" (#94366)
We're going to go with custom images instead, though we don't have an
implementation for this yet.
This does save a meaningful amount of minutes, but it also significantly
increases complexity.
This is a clean revert, minus the fix that the PR included for listening
on localhost in `packages/next/src/build/analyze/index.ts`, which is
still good.