feat(amazon q): adding view transformation summary to chat when code transformation complete and summary available

[ntarakad-aws]

Problem

We want to be able to have a button that is able to show the transformation summary when it is available. Currently the summary is automatically loaded when the proposed changes are downloaded.

Solution

In this way, we don't need to have the summary.md and associated icons in the proposed changes and the user can click on this button to view the transformation summary.

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[github-actions]

• This pull request modifies code in src/* but no tests were added/updated.
  • Confirm whether tests should be added or ensure the PR description explains why tests are not required.

[github-actions]

• This pull request modifies code in src/* but no tests were added/updated.
  • Confirm whether tests should be added or ensure the PR description explains why tests are not required.
• This pull request implements a feat or fix, so it must include a changelog entry (unless the fix is for an unreleased feature). Review the changelog guidelines.
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