[Fat module] fluent-theme should imports from bundle only

[compulim]

Changelog Entry

Added

• fluent-theme: Changed dependencies to import solely from the "bundle" package, in PR #5584, by @compulim

Description

This is for preparing of the "fat module" bundling rework.

In "fat module" world, fluent-theme will depend on bundle package only. Other packages will be (eventually) fold into bundle.

Design

Specific Changes

• Exporting some internals via new bundle/internal exports
  • We need to review them to see if we can export them
• Moved fluent-theme to only depend on botframework-webchat
• Allowlisted some ESM-only packages in Jest
  • These dependencies were from Adaptive Cards, where it is imported when via the bundle package

• I have added tests and executed them locally
• I have updated CHANGELOG.md
• I have updated documentation

Review Checklist

This section is for contributors to review your work.

• Accessibility reviewed (tab order, content readability, alt text, color contrast)
• Browser and platform compatibilities reviewed
• CSS styles reviewed (minimal rules, no z-index)
• Documents reviewed (docs, samples, live demo)
• Internationalization reviewed (strings, unit formatting)
• package.json and package-lock.json reviewed
• Security reviewed (no data URIs, check for nonce leak)
• Tests reviewed (coverage, legitimacy)