fix(prettier): Properly handle lint-stage files (#6970)

Now handles top level files and recursive files in folders.

Set max line length to be 100

.prettierrc

@@ -1,4 +1,5 @@
 semi: true
 trailingComma: "es5"
 singleQuote: true
-arrowParens: "avoid"
+arrowParens: "avoid"
+printWidth: 100