refactor: (GenAI) Reorganized Image Generation Samples (Group B)

[Thoughtseize1]

Region_tag	New folder name	FIlename
generativeaionvertexai_imagen_verify_image_watermark	Image Geneneration	verify_image_watermark.py
generativeaionvertexai_imagen_edit_image_inpainting_insert_mask_mode	Image Geneneration	edit_image_inpainting_insert_mask_mode.py
generativeaionvertexai_imagen_edit_image_inpainting_insert_mask	Image Geneneration	edit_image_inpainting_insert_mask.py
generativeaionvertexai_imagen_edit_image_inpainting_remove_mask_mode	Image Geneneration	edit_image_inpainting_remove_mask_mode.py
generativeaionvertexai_imagen_edit_image_inpainting_remove_mask	Image Geneneration	edit_image_inpainting_remove_mask.py
generativeaionvertexai_imagen_edit_image_mask_free	Image Geneneration	edit_image_mask_free.py
generativeaionvertexai_imagen_edit_image_mask	Image Geneneration	edit_image_mask.py
generativeaionvertexai_imagen_edit_image_outpainting_mask	Image Geneneration	edit_image_outpainting_mask.py
generativeaionvertexai_imagen_edit_image_product_image	Image Geneneration	edit_image_product_image.py
generativeaionvertexai_imagen_get_short_form_image_captions	Image Geneneration	get_short_form_image_captions.py
generativeaionvertexai_imagen_get_short_form_image_responses	Image Geneneration	get_short_form_image_responses.py
generativeaionvertexai_imagen_generate_image	Image Geneneration	generate_image.py

The name of the test files in the /imagen folder has been changed to avoid duplication and Nox errors.
Example: generate_image_test.py -> generate_image_test_.py

❗FOLDER need to be deleted after approval:
/generative_ai/imagen

Checklist

• I have followed Sample Guidelines from AUTHORING_GUIDE.MD
• README is updated to include all relevant information
• Tests pass: nox -s py-3.9 (see Test Environment Setup)
• Lint pass: nox -s lint (see Test Environment Setup)
• These samples need a new API enabled in testing projects to pass (let us know which ones)
• These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• Please merge this PR for me once it is approved

[snippet-bot]

Here is the summary of changes.

You are about to add 12 region tags.

• generative_ai/image_geneneration/edit_image_inpainting_insert_mask.py:32, tag generativeaionvertexai_imagen_edit_image_inpainting_insert_mask
• generative_ai/image_geneneration/edit_image_inpainting_insert_mask_mode.py:33, tag generativeaionvertexai_imagen_edit_image_inpainting_insert_mask_mode
• generative_ai/image_geneneration/edit_image_inpainting_remove_mask.py:31, tag generativeaionvertexai_imagen_edit_image_inpainting_remove_mask
• generative_ai/image_geneneration/edit_image_inpainting_remove_mask_mode.py:33, tag generativeaionvertexai_imagen_edit_image_inpainting_remove_mask_mode
• generative_ai/image_geneneration/edit_image_mask.py:31, tag generativeaionvertexai_imagen_edit_image_mask
• generative_ai/image_geneneration/edit_image_mask_free.py:29, tag generativeaionvertexai_imagen_edit_image_mask_free
• generative_ai/image_geneneration/edit_image_outpainting_mask.py:32, tag generativeaionvertexai_imagen_edit_image_outpainting_mask
• generative_ai/image_geneneration/edit_image_product_image.py:30, tag generativeaionvertexai_imagen_edit_image_product_image
• generative_ai/image_geneneration/generate_image.py:28, tag generativeaionvertexai_imagen_generate_image
• generative_ai/image_geneneration/get_short_form_image_captions.py:23, tag generativeaionvertexai_imagen_get_short_form_image_captions
• generative_ai/image_geneneration/get_short_form_image_responses.py:24, tag generativeaionvertexai_imagen_get_short_form_image_responses
• generative_ai/image_geneneration/verify_image_watermark.py:30, tag generativeaionvertexai_imagen_verify_image_watermark

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[msampathkumar]

LGTM