fix(ci): Return an error code on the failed AST Changes step. (#4930)

Closes #4929

.github/workflows/ci.yml

@@ -293,4 +293,4 @@ jobs:
         run: |
           cargo run -p oxc_ast_tools
           git diff --exit-code ||
-          echo 'AST changes caused the "generated" code to get outdated. Have you forgotten to run the `just ast` command and/or commit generated codes?'
+          (echo 'AST changes caused the "generated" code to get outdated. Have you forgotten to run the `just ast` command and/or commit generated codes?' && exit 1)