Python: Azure AI mapping HostedImageGenerationTool to ImageGenTool

[giles17]

Motivation and Context

This PR fixes the Azure AI image generation sample by adding the missing handler for HostedImageGenerationTool in the Azure AI integration layer and updating the sample to use the correct content types for image generation results.

Changes:

• Added HostedImageGenerationTool to ImageGenTool mapping in Azure AI integration
• Updated sample to use ImageGenerationToolResultContent instead of DataContent for extracting image data
• Changed image save location from script directory to OS temporary directory
• Updated model name from gpt-image-1-mini to gpt-image-1 in tool options (the Image Generation tool is empowered by the gpt-image-1 model.)

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.

[markwallace-microsoft]

Python Test Coverage Report •

File	Stmts	Miss	Cover	Missing
packages/azure-ai/agent_framework_azure_ai
_shared.py	301	123	59%	103–104, 107–109, 112–117, 119, 150, 152, 154, 156, 201, 289–292, 295–297, 300–301, 311, 318–320, 346–355, 360, 408, 424–426, 428–445, 453–456, 461–462, 466–473, 478–479, 485–488, 490, 510–512, 515–516, 518, 530, 532–533, 536–539, 542, 544–545, 547–555, 557, 593, 595–598, 600, 606, 612, 616, 631, 634–635, 637
TOTAL	17478	2717	84%

Python Unit Test Overview

Tests	Skipped	Failures	Errors	Time
3186	213 💤	0 ❌	0 🔥	1m 5s ⏱️

[Copilot]

Pull request overview

This PR fixes the Azure AI image generation sample by adding the missing handler for HostedImageGenerationTool in the Azure AI integration layer and updating the sample to use the correct content types for image generation results.

Changes:

• Added HostedImageGenerationTool to ImageGenTool mapping in Azure AI integration
• Updated sample to use ImageGenerationToolResultContent instead of DataContent for extracting image data
• Changed image save location from script directory to OS temporary directory
• Updated model name from gpt-image-1-mini to gpt-image-1 in tool options

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
python/samples/getting_started/agents/azure_ai/azure_ai_with_image_generation.py	Updated sample to use correct content types and save location; however, uses incorrect option keys
python/packages/azure-ai/agent_framework_azure_ai/_shared.py	Added handler to map HostedImageGenerationTool to Azure AI's ImageGenTool