Cherry pick of #1083 Bump KFP to 0.2.5

[Bobgy]

Which issue is resolved by this Pull Request:
Resolves #984

Description of your changes:
Cherry pick of bumping KFP to 0.2.5

Checklist:

• Unit tests have been rebuilt:
  1. cd manifests/tests
  2. make generate-changed-only
  3. make test

[kubeflow-bot]

This change is 

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[Bobgy]

/assign @richardsliu @jlewi

[Jeffwan]

/lgtm

[richardsliu]

/lgtm
/approve

[k8s-ci-robot]

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