Align notebook with updated basic workflow code

[Marietta (marietta-a)]

This PR aligns the notebook with the updated basic workflow in #653

[github-actions]

👋 Thanks for contributing Marietta (@marietta-a)! We will review the pull request and get back to you soon.

[Copilot]

Pull request overview

This PR updates the Lesson 08 “basic workflow” .NET notebook to match the newer workflow sample introduced in PR #653, primarily by switching to the current agent creation, streaming execution, and streaming event types.

Changes:

• Updated referenced SDK/package versions in the notebook (including moving to floating major versions for some packages).
• Migrated agent creation from GetOpenAIResponseClient(...).CreateAIAgent(...) to GetChatClient(...).AsIChatClient().AsAIAgent(...).
• Updated streaming execution/event handling (StreamAsync → RunStreamingAsync, AgentRunUpdateEvent → AgentResponseUpdateEvent).

Suppressed comments (3)

08-multi-agent/code_samples/workflows-agent-framework/dotNET/01.dotnet-agent-framework-workflow-ghmodel-basic.ipynb:205

• This cell output lists floating versions (e.g., OpenTelemetry.Api, 1.*) while execution_count is null, so the stored "Installed Packages" output may be stale/misleading. Consider clearing outputs and letting readers run the cell to see resolved versions.

   "outputs": [
    {
     "data": {
      "text/html": [
       "<div><div></div><div></div><div><strong>Installed Packages</strong><ul><li><span>Azure.Identity, 1.15.0</span></li><li><span>OpenTelemetry.Api, 1.*</span></li><li><span>System.Linq.Async, 6.0.3</span></li></ul></div></div>"
      ]

08-multi-agent/code_samples/workflows-agent-framework/dotNET/01.dotnet-agent-framework-workflow-ghmodel-basic.ipynb:249

• This cell output shows a floating version (Microsoft.Agents.AI.Workflows, 1.*) rather than the resolved version, which can be confusing in a saved notebook. Consider clearing outputs (or re-running and capturing resolved versions).

   "outputs": [
    {
     "data": {
      "text/html": [
       "<div><div></div><div></div><div><strong>Installed Packages</strong><ul><li><span>Microsoft.Agents.AI.Workflows, 1.*</span></li></ul></div></div>"
      ]

08-multi-agent/code_samples/workflows-agent-framework/dotNET/01.dotnet-agent-framework-workflow-ghmodel-basic.ipynb:277

• This cell output shows a floating/prerelease range (Microsoft.Agents.AI.OpenAI, 1.*-*) rather than the resolved version. For a saved notebook, it’s clearer either to capture the resolved version or clear this output.

   "outputs": [
    {
     "data": {
      "text/html": [
       "<div><div></div><div></div><div><strong>Installed Packages</strong><ul><li><span>Microsoft.Agents.AI.OpenAI, 1.*-*</span></li></ul></div></div>"
      ]

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