fix: fix openai prompt behavior on RAI errors

[mhamilton723]

Related Issues/PRs

#xxx

What changes are proposed in this pull request?

Briefly describe the changes included in this Pull Request.

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?

• No. You can skip this section.
• Yes. Make sure you have added samples following below steps.

1. Find the corresponding markdown file for your new feature in website/docs/documentation folder.
   Make sure you choose the correct class estimators/transformers and namespace.
2. Follow the pattern in markdown file and add another section for your new API, including pyspark, scala (and .NET potentially) samples.
3. Make sure the DocTable points to correct API link.
4. Navigate to website folder, and run yarn run start to make sure the website renders correctly.
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.

[mhamilton723]

/azp run

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 94.44444% with 1 line in your changes missing coverage. Please review.

Project coverage is 84.45%. Comparing base (392f601) to head (fcd3655).

Files with missing lines	Patch %	Lines
...zure/synapse/ml/services/openai/OpenAIPrompt.scala	94.44%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2279   +/-   ##
=======================================
  Coverage   84.45%   84.45%           
=======================================
  Files         327      327           
  Lines       16775    16788   +13     
  Branches     1499     1500    +1     
=======================================
+ Hits        14167    14179   +12     
- Misses       2608     2609    +1     

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