[XrossFox]

Description

Deletes image generation examples, tests, and related resources that have either been migrated to the new google-genai SDK or have fallen into disuse.

Fixes b/555328863

Checklist

Testing

• I have tested this change on a live environment and verified it works as intended.

Compliance & Style

• I have followed the Sample Guidelines.
• The README is updated with all relevant information (if applicable).
• If this PR adds a new sample directory: I updated the CODEOWNERS file.

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Post-Approval Actions

• Please merge this PR for me once it is approved

[gemini-code-assist]

Code Review

This pull request attempts to update the model used for image editing and inpainting tasks from 'imagen-3.0-capability-001' to 'gemini-3.1-flash-image'. However, the reviewer points out that 'gemini-3.1-flash-image' is not a valid model for image editing in the Google GenAI SDK, and using it will result in API errors. It is recommended to revert these changes back to 'imagen-3.0-capability-001'.

[amcolin]

LGTM

[snippet-bot]

Here is the summary of changes.

You are about to delete 3 region tags.

• genai/image_generation/imggen_canny_ctrl_type_with_txt_img.py:17, tag googlegenaisdk_imggen_canny_ctrl_type_with_txt_img
• genai/image_generation/imggen_inpainting_insert_mask_with_txt_img.py:19, tag googlegenaisdk_imggen_inpainting_insert_mask_with_txt_img
• genai/image_generation/imggen_inpainting_insert_with_txt_img.py:19, tag googlegenaisdk_imggen_inpainting_insert_with_txt_img

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