[v2compat] pipeline with output name containing space cannot compile

[Bobgy]

Environment

• KFP SDK version: master

Steps to reproduce

1. Start with https://github.com/kubeflow/pipelines/blob/master/samples/test/reused_component.py,
2. Rename output name from sum to Total Value.
3. Compile and run in v2 compatible mode.
4. It fails with a KeyError looking for Total Value

Expected result

The pipeline should compile and run.

Materials and Reference

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[Bobgy]

/assign @chensun

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