EditotConfig: Relax 2 space indentation rule to only the `package.jso…

…n` and `*.yml` files.

This is a partial revert of WordPress@7c9cfe4, originally it was added so that it was in sync with WordPress' `.editorconfig`, rather WordPress should follow suit of how it's done here.

.editorconfig

@@ -8,7 +8,7 @@ charset = utf-8
 trim_trailing_whitespace = true
 insert_final_newline = true
 
-[{*.json,*.yml}]
+[{package.json,*.yml}]
 indent_style = space
 indent_size = 2