Apply Prettier to the codebase

[dkozickis]

Overview

• Apply Prettier to the codebase
• Add lint:prettier and lint:prettier:fix scripts in package.json

Cannot use ember-template-lint-plugin-prettier plugin for ember-template-lint because of this issue - ember-template-lint/ember-template-lint-plugin-prettier#268

Setup

1. Checkout
2. Try to run pnpm run lint:prettier

Challenges/uncertainties

Do we need to add pre-commit hook that will run prettier:fix on changed files?

Checks PR readiness

• changelog
• npm lint