feat(build-info): pass feature flags as json and change plugins to an object

[lukasholzer]

BREAKING CHANGE: Plugin build settings now use an object array, not string lists, allowing extra details like install source and if always needed at runtime.

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Summary

Fixes https://linear.app/netlify/issue/FRA-139/update-build-info-to-include-netlifynext-runtime

Currently, we have a lot of hardcoded instances of the next runtime inside the react UI and the CLI, where we determine if it needs to be auto-installed:

• https://github.com/netlify/netlify-react-ui/blob/main/apps/netlify-react-ui/src/actions/repos.ts#L219-L239
• https://github.com/netlify/cli/blob/main/src/utils/init/utils.ts#L19-L43

This makes it hard to roll out the new runtime over a central place. Therefore, I've introduced a breaking change here, making the plugins an array of objects that contains the additional information that the next runtime should always be automatically installed.

Based on the feature flag, we can now roll out the new or old runtime seamlessly with this change.

Therefore we had to change the featureflags to be a JSON of key value objects to retrieve the value of the string flag.

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[lukasholzer]

I'm going to cut a pre-release before merging this and trying to prepare the breaking changes already upfront on the repositories.

Latest RC version is on @netlify/[email protected]