Add test for checking for storybook files

[jsjoeio]

Summary

Right now, when you add a new component, and if the template has a storybook piece, we're not testing for that. We caught this yesterday when Jenn did have storybook in a project, tried it, and the path was incorrect.

Basic example

Add a test that checks if the inject_story template works.

Motivation

We should ensure this works as expected.

[jsjoeio]

Also, bug with the import path, you don't need to include the root, because it's a relative path, doesn't need to be absolute