Add notebook for qwen-image

[openvino-dev-samples]

CVS-173999

[review-notebook-app]

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Pull request overview

This PR adds a new notebook demonstrating text-to-image generation using the Qwen-Image model with OpenVINO. The notebook includes model conversion, optimization, and an interactive Gradio interface.

Key changes:

• Added Gradio helper for creating an interactive demo with prompt enhancement and multi-language support
• Added README documenting the notebook's purpose and contents
• Excluded the notebook from Docker-based CI testing

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 4 comments.

File	Description
notebooks/qwen-image/gradio_helper.py	Implements Gradio UI with image generation logic, prompt enhancement for English/Chinese, and configurable parameters
notebooks/qwen-image/README.md	Documents the Qwen-Image notebook tutorial and installation instructions
.ci/ignore_treon_docker.txt	Adds qwen-image notebook to CI exclusion list

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[Copilot]

The function doesn't handle the case when language detection returns neither 'zh' nor 'en', resulting in an implicit None return. Add a default case: after line 33, add else: return original_prompt or change line 31 to just else: to handle all non-Chinese prompts.

Suggested change

	return polish_prompt_en(input_prompt)
	return polish_prompt_en(input_prompt)
	else:
	return input_prompt