chore(genai): remove unused image generation samples 2/5

[XrossFox]

Description

Deletes unused image generation examples (inpainting removal and mask-free edit) and updates the corresponding tests.

Fixes b/555319066

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 removes the sample scripts and corresponding unit tests for inpainting removal with mask, inpainting removal without mask, and mask-free image editing. I have no feedback to provide as there are no review comments.

[amcolin]

LGTM

[snippet-bot]

Here is the summary of changes.

You are about to delete 3 region tags.

• genai/image_generation/imggen_inpainting_removal_mask_with_txt_img.py:19, tag googlegenaisdk_imggen_inpainting_removal_mask_with_txt_img
• genai/image_generation/imggen_inpainting_removal_with_txt_img.py:19, tag googlegenaisdk_imggen_inpainting_removal_with_txt_img
• genai/image_generation/imggen_mask_free_edit_with_txt_img.py:19, tag googlegenaisdk_imggen_mask_free_edit_with_txt_img

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