[Failing Test]: GroupBy example tests (groupby_test.py) fail

[hjtran]

What happened?

The test utility assert_that has to be run in a pipeline that hasn't been executed. Before #30771 it was easy to accidentally do it after a pipeline had already been executed which resulted in a test that would always pass.

After #30771 , it'll no longer be possible to do this. As a result, it turns out groupby_test.py's unit tests are always passing. I've skipped them temporarily

Issue Failure

Failure: Test is continually failing

Issue Priority

Priority: 2 (backlog / disabled test but we think the product is healthy)

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