feat(tools): remove eslint-plugin-prettier for prettier (#42438)

* feat: remove eslint-plugin-prettier for prettier

This removes the annoying lint warnings when all that needs to change is
formatting

* fix: use .js lint-staged config to ignore properly

* fix: lint everything if a lot of files are changed

It's faster than making lots of individual linter calls

* chore: apply prettier

* fix: ignore code in curriculum-file-structure

tools/contributor/one-off-scripts/get-unknown-repo-prs.js

@@ -102,7 +102,7 @@ log.start();
     log.finish();
     console.log('Finished finding unknown repo PRs with merge conflicts');
   })
-  .catch(err => {
+  .catch((err) => {
     log.finish();
     console.log(err);
   });