Minimize the bundling of prettier in @storybook/core

[JReinhold]

Prettier has been identified as a big part of the bundled output in @storybook/core. It is primarily used for:

1. Formatting code according to the project's settings when writing/modifying .stories.ts files via Controls
2. Formatting code snippets in the docs' syntax highlighter

The first usage can instead use an optional dependency on Prettier (and has so before AFAIK).

The second usage presumably only requires prettier/standalone without all the plugins, which is a significantly smaller dependency to prebundle.

See #28571 for a prior attempt at this - ignore the babel parts however, they have already been handled in another way.