fix: Use Java Class Loader When Using Link Service

[lhrotk]

What changes are proposed in this pull request?

Use java class loader to replace scala class loader in Synapse link service.

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.

Manually tested on Synapse

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.

[github-actions]

Hey @lhrotk 👋!
Thank you so much for contributing to our repository 🙌.
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!

Examples of commit messages with semantic prefixes:

• fix: Fix LightGBM crashes with empty partitions
• feat: Make HTTP on Spark back-offs configurable
• docs: Update Spark Serving usage
• build: Add codecov support
• perf: improve LightGBM memory usage
• refactor: make python code generation rely on classes
• style: Remove nulls from CNTKModel
• test: Add test coverage for CNTKModel

To test your commit locally, please follow our guild on building from source.
Check out the developer guide for additional guidance on testing your change.

[lhrotk]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[codecov-commenter]

Codecov Report

Attention: 16 lines in your changes are missing coverage. Please review.

Comparison is base (9b20829) 86.21% compared to head (f244c26) 85.28%.

Files	Patch %	Lines
...ure/synapse/ml/services/CognitiveServiceBase.scala	0.00%	16 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2135      +/-   ##
==========================================
- Coverage   86.21%   85.28%   -0.93%     
==========================================
  Files         312      312              
  Lines       16477    16483       +6     
  Branches     1460     1462       +2     
==========================================
- Hits        14206    14058     -148     
- Misses       2271     2425     +154     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[mhamilton723]

If this is verified on Fabric then it looks good to me! Thank you Cruise!

[lhrotk]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).