Fix: update adaptive card in a single mutation to avoid layout shifts

[OEvgeny]

Fixes #

Changelog Entry

• Fixed re-rendering Adaptive Card should not cause momentarily layout shift, by @OEvgeny, in PR #5494
  This fixes the layout shift when we replace the adaptive card rendered.

Design

Instead of doing removeChild then addChild, call replaceChildren and leave cleanup to a dedicated useEffect.

Specific Changes

• Fixed the update adaptive card rendering logic
• Added a test verifying there is a single mutation in the DOM happens

-

• 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)

[compulim]

Nitpicking.