Core: Fix storySort order with whitespace in story paths

[ghengeveld]

Issue: #13311

What I did

This consistently splits kind in a way that allows whitespace around the path separator. This was already implemented in the stories API using trim() on each part, but a regex separator is more efficient and less fragile. The storySort function didn't do this yet, which is why manually specifying an order only worked when including the whitespace in each value (see #13311).

Technically this is a breaking change, because it'll break ordering for people who've specified order including whitespace. We could circumvent that by trimming values of order. WDYT @shilman ?

How to test

• Is this testable with Jest or Chromatic screenshots? Updated the unit test
• Does this need a new example in the kitchen sink apps? No
• Does this need an update to the documentation? No

If your answer is yes to any of these, please make sure to include it in your PR.

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[shilman]

LGTM! Thanks @ghengeveld 🙏

This just looks like a bug to me, and if ends up being a breaking change for some people let's see if people complain and update then. I don't think we need to overcomplicate it.

[shilman]

@ghengeveld there's a failing unit test tho! 🔍 ❌