Next.js: Support disableStaticImages setting

[valentinpalkovic]

Closes #22899

What I did

Support disableStaticImages setting in Next.js-based Storybooks.

How to test

• Create a Next.js sandbox
• set the setting like described here: https://nextjs.org/docs/pages/api-reference/components/image#disablestaticimages
• Importing an image like import asset from './asset.jpg' shouldn't return an object anymore, but a plain string instead, which can be passed to an <img ... /> element.

Checklist

• Make sure your changes are tested (stories and/or unit, integration, or end-to-end tests)
• Make sure to add/update documentation regarding your changes
• If you are deprecating/removing a feature, make sure to update
  MIGRATION.MD

Maintainers

• If this PR should be tested against many or all sandboxes,
  make sure to add the ci:merged or ci:daily GH label to it.
• Make sure this PR contains one of the labels below.

["cleanup", "BREAKING CHANGE", "feature request", "bug", "documentation", "maintenance", "dependencies", "other"]

[yannbf]

LGTM!

[ssijak]

Very much interested in this. What is the expected timeline for this being available on npm?

[KseniaAK]

Hi! Thank you for working on this fix! My team is also very interested in this work as it's a blocker for our app's upgrade to storybook v7. Seconding the above question - what is the timeline for its release?

[valentinpalkovic]

Hi @ssijak, @KseniaAK

Hopefully the next few days we can release this feature with a next 7.1 beta release!