fix: Remove extraneous "Foo" type from Py codegen

[BrendanWalsh]

This type appears to be an artifact from testing/development and has no references in the source.

[github-actions]

Hey @BrendanWalsh 👋!
Thank you so much for contributing to our repository 🙌.
Someone from SynapseML Team will be reviewing this pull request soon.

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

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[mhamilton723]

Lol

[mhamilton723]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[codecov-commenter]

Codecov Report

Merging #1867 (21a2497) into master (dedcbda) will decrease coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1867      +/-   ##
==========================================
- Coverage   86.86%   86.81%   -0.05%     
==========================================
  Files         299      299              
  Lines       15521    15521              
  Branches      793      793              
==========================================
- Hits        13482    13475       -7     
- Misses       2039     2046       +7     

Impacted Files	Coverage Δ
...microsoft/azure/synapse/ml/codegen/PyCodegen.scala	91.48% <ø> (ø)

... and 2 files with indirect coverage changes

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