Core: Followup changing CJS entrypoints to ESM

[tmeasday]

Following up on #17868 -- rather than importing the ESM files, we also need to actually write ESM code! Thanks @IanVS

I would also be OK with just reverting the original PR and removing all these files in 7.0 (three of the 5 files don't work already, as noted below, anyway).

Now that #17875 has gone out, there is less obvious need for this change.

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[tmeasday]

@ndelangen these three "entrypoints" (@storybook-components/html, @storybook-router/utils and @storybook-theming/create) don't actually work now we pre-bundle. I included the change just to call it out in the PR, but right now these files don't point to anything (thus the linting issue)

[ndelangen]

hmm, that seems like a pretty big deal.. I do not remember why we had those separate entrypoints to begin with, do you remember why we introduced those?\

[tmeasday]

Nope, I know nothing about them. @shilman?

[shilman]

@tmeasday @ndelangen

@storybook/components/html was a grouping for MDX docs elements. we deprecated it a year ago, so if we have an unintentional breaking change there it's not the end of the world:

https://github.com/storybookjs/storybook/blob/next/lib/components/src/html.tsx

I'm less sure about the other two. @ndelangen I think that's more your territory.