Revert "Workaround for process_start_time_seconds metric fix" after upgrading component-base library

[Jiawei0227]

The current process_start_time_seconds does not work because a bug in the component-base library. The fix is here:
kubernetes/kubernetes#96435

But that can take pretty long time before we can upgrade the dependency. So until then, we can use the workaround #68 to fix that.

This issue is to track that we need to revert this workaround back after we upgrade the dependency.

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/lifecycle stale

[Jiawei0227]

/remove-lifecycle stale

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/lifecycle stale

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/lifecycle rotten

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/close

[k8s-ci-robot]

@fejta-bot: Closing this issue.

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/close

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