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/lib/validation/valid-labels.js

@@ -6,7 +6,7 @@ const validLabels = {
   russian: 'language: Russian',
   spanish: 'language: Spanish',
   curriculum: 'scope: curriculum',
-  docs: 'scope: docs',
+  docs: 'scope: docs'
 };
 
 module.exports = { validLabels };