Vertex AI Tabular regression pipeline test failure

[kweinmeister]

Test failure in tabular regression test:

1) AI platform create training pipeline tabular regression
    should create a new tabular regression training pipeline:
    Error: Command failed: node ./create-training-pipeline-tabular-regression.js ...
NOT_FOUND: No valid transformation selected as default for column STRUCT_REPEATED.STRING_5000unique_NULLABLE.

      at execSync (test/create-training-pipeline-tabular-regression.test.js:25:28)
      at Context.<anonymous> (test/create-training-pipeline-tabular-regression.test.js:49:20)

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