Add files conf to prettier pre-commit setup. (#4177)

.pre-commit-config.yaml

@@ -18,6 +18,7 @@ repos:
     rev: v4.0.0-alpha.8
     hooks:
       - id: prettier
+        files: .*\.{css,js,json,scss,yml,yaml}$
 
   - repo: https://github.com/pre-commit/mirrors-eslint
     rev: v9.13.0