fix(sdk): Backport fixes in kubeflow/pipelines#11075

[rimolive]

Introduced back the functions to convert k8s size values to float, but moved to kfp.dsl.utils

Description of your changes: fixes #11390

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[HumairAK]

Thanks @rimolive can you also add this change to: https://github.com/kubeflow/pipelines/blob/master/sdk/RELEASE.md#bug-fixes-and-other-changes? otherwise lgtm