Prepare azure.ai.agents 0.1.9-preview release

[Copilot]

Prepares changelog and version bump for the azure.ai.agents extension patch release.

Changes

• Version: 0.1.8-preview → 0.1.9-preview

  • version.txt
  • extension.yaml

• Changelog: 7 PRs merged since last release

  • Add a naive attempt at downloading manifest #6631 - Manifest download from public repos without auth
  • [Azure.Ai.Agents] Fix issue with slash in path name for manifest download #6665 - Fix manifest path handling with slashes
  • Simplify azd ai agent/finetuning init to use --minimal flag #6670 - Simplify init with --minimal flag
  • [AI Agents] Block attempts to use extension with prompt agents for now #6672 - Block prompt agents (unsupported)
  • Fix panic in agent.yaml parsing and enable CI tests for azure.ai.agents #6683 - Fix panic on missing template field in agent.yaml
  • azure.ai.agents - Fix unsafe DefaultAzureCredential usage in production #6693 - Fix unsafe DefaultAzureCredential usage
  • Remove clickable hyperlink from agent endpoint and redirect to invocation docs #6695 - Plain text agent endpoint with docs link

Original prompt

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This section details on the original issue you should resolve

<issue_title>Prepare new patch release of azure.ai.agents</issue_title>
<issue_description>In addition, please include these open PRs in the changelog

• Fix panic in agent.yaml parsing and enable CI tests for azure.ai.agents #6683
• Remove clickable hyperlink from agent endpoint and redirect to invocation docs #6695</issue_description>

Comments on the Issue (you are @copilot in this section)

Custom agent used: Generate changelog (extensions)
Update an azd extension changelog and bump its version.

• Fixes Prepare new patch release of azure.ai.agents #6706

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