Update samples/core/ai_platform pipeline to follow data dependency

[ucdmkt]

Control dependency by .after() is not strictly necessary, because the first component returns outputs to the data path, which is to be used by the second component. Updating this to demonstrate a common practice.

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This change is 

[k8s-ci-robot]

Hi @ucdmkt. Thanks for your PR.

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[ucdmkt]

\cc @hongye-sun

[numerology]

/ok-to-test

[numerology]

/lgtm
/approve
Thanks @ucdmkt !

[k8s-ci-robot]

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