Core: Fix default framework options handling

[ndelangen]

fixes: #18635 (comment)

So this:

framework = await presets.apply('framework')

Will return the setting from main.js from the user only.
It will not contain any additional frameworkOptions.

main.js is always last in the chain, so we need a new property to merge the options with the default

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[shilman]

This pattern is slightly weird, since it allows users to override framework and frameworkOptions independently. However, I don't have a better proposal! 🤷