Core: Fix HMR error recovery

[shilman]

Issue: #7165

What I did

Error was not getting properly cleared in the story store, so I tried a few ways:

• First commit changes story_store. The issue is that when user navigates, the error gets cleared.

• Second commit undoes the first, and clears the error in the config_api (call configure(...)). This one clears the error when the user fixes the error OR when the user updates a different file

• I cannot figure out how to clear the error only when the original error is fixed. I think the second approach is OK for now.

How to test

cd examples/official-storybook
yarn storybook
# edit a story & introduce a syntax error => error message
# navigate to another story => error message
# fix the error => story

[vercel]

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