Make the TransformService test suite not pass trivially.

[chamikaramj]

The test suite is green currently but seems like it's just passing trivially due to tests being skipped.

This fixes #30238.

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[chamikaramj]

assign set of reviewers

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[chamikaramj]

Also, passing run with this update: https://github.com/apache/beam/actions/runs/8148218268

Note: (29 tests    6 ✅ )

[Abacn]

Thank you!