Backport "chore: remove all the warnings in the compiler codebase" to 3.3 LTS#355

tgodzik merged 2 commits intolts-3.3scala/scala3-lts:lts-3.3from

backport-lts-3.3-22975scala/scala3-lts:backport-lts-3.3-22975Copy head branch name to clipboard