Exclude binaries check from knip to fix CI build

Knip doesn't have a GitHub Actions plugin, so it reports binaries
referenced in workflow files as "unlisted binaries" errors. Since
build:test and test:e2e are legitimate package.json scripts used
in the Playwright workflow, we exclude the binaries check.

Changes:
- Add --exclude binaries flag to both knip commands in CI
- This allows knip to check for dead code, dependencies, and exports
  while ignoring the expected unlisted binaries warning

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: justin808

.github/workflows/lint-js-and-ruby.yml

@@ -107,8 +107,8 @@ jobs:
         run: cd spec/dummy && RAILS_ENV="test" bundle exec rake react_on_rails:generate_packs
       - name: Detect dead code
         run: |
-          yarn run knip
-          yarn run knip --production
+          yarn run knip --exclude binaries
+          yarn run knip --production --exclude binaries
       - name: Lint JS
         run: yarn run eslint --report-unused-disable-directives
       - name: Check formatting