feat: Add refreshAADToken and SynapsePlatformUtils for internal usage

[serena-ruan]

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?

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

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6. Make sure the WebsiteSamplesTests job pass in the pipeline.

[github-actions[bot]]

Hey @serena-ruan :wave:! Thank you so much for contributing to our repository :raised_hands:. Someone from SynapseML Team will be reviewing this pull request soon.

We use semantic commit messages to streamline the release process. Before your pull request can be merged, you should make sure your first commit and PR title start with a semantic prefix. This helps us to create release messages and credit you for your hard work!

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• fix: Fix LightGBM crashes with empty partitions
• feat: Make HTTP on Spark back-offs configurable
• docs: Update Spark Serving usage
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• style: Remove nulls from CNTKModel
• test: Add test coverage for CNTKModel

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[serena-ruan]

/azp run

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[codecov-commenter]

Codecov Report

Merging #1845 (b257219) into master (1b71c1d) will decrease coverage by 0.13%. The diff coverage is 24.39%.

@@            Coverage Diff             @@
##           master    #1845      +/-   ##
==========================================
- Coverage   86.71%   86.59%   -0.13%     
==========================================
  Files         301      302       +1     
  Lines       15622    15660      +38     
  Branches      813      796      -17     
==========================================
+ Hits        13547    13560      +13     
- Misses       2075     2100      +25     

Impacted Files	Coverage Δ
...e/synapse/ml/core/utils/SynapsePlatformUtils.scala	20.00% <20.00%> (ø)
...re/synapse/ml/cognitive/CognitiveServiceBase.scala	78.86% <36.36%> (-2.86%)	:arrow_down:

... and 4 files with indirect coverage changes

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[serena-ruan]

/azp run

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[serena-ruan]

/azp run

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[serena-ruan]

/azp run

[azure-pipelines[bot]]

Pull request contains merge conflicts.

[serena-ruan]

/azp run

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Azure Pipelines successfully started running 1 pipeline(s).