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/config.js

@@ -8,9 +8,7 @@ const envVarsSchema = Joi.object({
     .allow(['development', 'production', 'test', 'provision'])
     .default('development'),
   PORT: Joi.number().default(3001),
-  MONGO_HOST: Joi.string()
-    .required()
-    .description('Mongo DB host url'),
+  MONGO_HOST: Joi.string().required().description('Mongo DB host url'),
   GITHUB_USERNAME: Joi.string().required(),
   GITHUB_ACCESS_TOKEN: Joi.string().required(),
   REPOSITORY_OWNER: Joi.string().required(),