Refactor aws samples to match new folder structure

[carolynwang]

Summary
Updated links to samples in READMEs and paths to components in sample pipelines to match new samples folder structure

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This change is 

[k8s-ci-robot]

Hi @carolynwang. Thanks for your PR.

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[Jeffwan]

/ok-to-test

[Jeffwan]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Jeffwan

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[Jeffwan]

/test kubeflow-pipeline-sample-test

[gaoning777]

Thanks for fixing this. We should've updated it when the samples are restructured.