Add option to start storybook without prompting for fixtures

What does this MR do and why?

When working with storybook locally, if you have to stop and restart it frequently the prompt to re-download fixtures is a nuisance. This MR adds an npm script that can be run that will skip the fixtures check and use the version you already have downloaded.

References

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MR acceptance checklist

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Screenshots or screen recordings

N/A

How to set up and validate locally

  1. Run yarn stortbook:start:nofixtures
  2. Storybook will start and will not ask you if you want to download fixtures

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