Webpack5: Apply named exports order logic for stories only

[shilman]

Issue: #17914 #17587 #18263

What I did

Webpack5 does not preserve the order named exports. I created a babel plugin which inserts a special magic named export __namedExportsOrder to preserve this order. Unfortunately, this is being applied to all files in the project and can interfere with other tools that need this order.

This PR fixes it with:

• Fix logic where incoming babel config can be undefined
• Scope the named exports plugin to only apply to story files

How to test

I'm not sure! I tested this by hand editing node_modules in a sample project 😭 and looking at the raw source in the browser dev tools...

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[yannbf]

LGTM!