Python: Fix workflow samples for bugbash: part 2

[TaoChenOSU]

Motivation and Context

Part 2 of fixing workflow samples from bugbash

Description

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the Contribution Guidelines
• All unit tests pass, and I have added new tests where possible
• Is this a breaking change? If yes, add "[BREAKING]" prefix to the title of the PR.

[Copilot]

Pull request overview

This PR contains cleanup and bugfixes for workflow samples following a bugbash. The changes remove unused code, improve output formatting, and add important model compatibility warnings for samples that require specific GPT models.

Changes:

• Removed unused AgentResponseUpdate import and streaming output handling from checkpoint resume sample
• Simplified debug output by removing redundant agent_id printing and type annotations
• Added model compatibility warnings (gpt-5.1 requirement and gpt-5-mini failure notes) to two samples
• Improved output formatting with additional newline spacing

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
python/samples/03-workflows/orchestrations/handoff_with_tool_approval_checkpoint_resume.py	Removed unused AgentResponseUpdate import/handling, simplified debug output, improved formatting with newline
python/samples/03-workflows/declarative/customer_support/main.py	Added model compatibility comments warning about gpt-5.1 requirement and gpt-5-mini issues
python/samples/03-workflows/agents/azure_chat_agents_tool_calls_with_feedback.py	Added model compatibility comments warning about gpt-5.1 requirement and gpt-5-mini issues