fix: Add fail_level to reviewdog actions, use fail_on_error for shfmt

Add fail_level: error to the 5 reviewdog actions that support it
(misspell, hadolint, yamllint, actionlint, shellcheck). For shfmt,
which hasn't added fail_level support yet, use fail_on_error: true.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: michelabboud

.github/workflows/review.yml

@@ -58,7 +58,7 @@ jobs:
         uses: reviewdog/action-shfmt@v1
         with:
           level: warning
-          fail_level: error
+          fail_on_error: "true"
           shfmt_flags: "-i 2 -ci -bn"
           github_token: ${{ secrets.GITHUB_TOKEN }}
       -