Story sort should be stable

[tmeasday]

Describe the bug
We sort stories with Array.prototype.sort() which isn't guaranteed to be stable (as per JS spec).

For example in v8 < v7 (Chrome <70, Node <12 (?)) sorting was not stable: https://v8.dev/blog/array-sort

To Reproduce

1. Consider official storybook: https://storybooks-official.netlify.com/?path=/story/ui-panel--default -- notice the story order in latest chrome:

2. Notice the story order in Chromatic: (uses JSDOM, ie node sort)

In theory the order should be wrong in Chrome 69 also but I haven't yet been able to reproduce.

Expected behavior
The stories should stay in order.

[shilman]

Good golly!! I just released https://github.com/storybookjs/storybook/releases/tag/v5.3.0-alpha.44 containing PR #8795 that references this issue. Upgrade today to try it out!

You can find this prerelease on the @next NPM tag.

[shilman]

Whoopee!! I just released https://github.com/storybookjs/storybook/releases/tag/v5.2.8 containing PR #8795 that references this issue. Upgrade today to try it out!