chore: Replace placeholder with file name in prompt template

[levscaut]

Related Issues/PRs

#xxx

What changes are proposed in this pull request?

Replaced the placeholder s"[Content for column '$columnName' will be provided later as an attachment.]" with simply the file names in the message. For example:
Template: "Analyze this image: {image_path}"
Path column image_path with value /some/folder/photo.jpg
Previous result will be: "Analyze this image: [Content for column 'image_path' will be provided later as an attachment.]"
The result now will be: "Analyze this image: photo.jpg"

How is this patch tested?

• I have written tests (not required for typo or doc fix) and confirmed the proposed feature/bug-fix/change works.

Does this PR change any dependencies?

• No. You can skip this section.
• Yes. Make sure the dependencies are resolved correctly, and list changes here.

Does this PR add a new feature? If so, have you added samples on website?

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• Yes. Make sure you have added samples following below steps.

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   Make sure you choose the correct class estimators/transformers and namespace.
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3. Make sure the DocTable points to correct API link.
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5. Don't forget to add <!--pytest-codeblocks:cont--> before each python code blocks to enable auto-tests for python samples.
6. Make sure the WebsiteSamplesTests job pass in the pipeline.

[levscaut]

/azp run

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 86.95652% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.31%. Comparing base (b979064) to head (04b35aa).

Files with missing lines	Patch %	Lines
...zure/synapse/ml/services/openai/OpenAIPrompt.scala	86.95%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2456      +/-   ##
==========================================
- Coverage   84.35%   84.31%   -0.04%     
==========================================
  Files         335      335              
  Lines       17729    17734       +5     
  Branches     1621     1602      -19     
==========================================
- Hits        14955    14953       -2     
- Misses       2774     2781       +7     

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[levscaut]

/azp run

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[Copilot]

Pull request overview

This PR modifies the OpenAIPrompt transformer to replace path placeholders in prompt templates with actual filenames instead of generic attachment notices. Previously, path columns referenced in templates like {image_path} were replaced with text like "[Content for column 'image_path' will be provided later as an attachment.]". Now they are replaced with the actual filename (e.g., "photo.jpg") extracted from the path.

Key changes:

• Removed applyPathPlaceholders and attachmentPlaceholder methods that generated generic placeholder text
• Added new processPathColumns method that extracts filenames from path columns and creates temporary filename columns
• Updated transform method to use filename references in templates and clean up temporary columns after processing

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
OpenAIPrompt.scala	Refactored path column handling to extract and use actual filenames in prompt templates instead of placeholder text
OpenAIPromptSuite.scala	Removed test for deprecated applyPathPlaceholders method and reformatted unrelated test code

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[levscaut]

/azp run

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[levscaut]

/azp run

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