Convert timeout to milliseconds when using poll method

[t-yrka]

What type of PR is this?

/kind. bug

What this PR does / why we need it:

Makes poll/select timeout consistent.

Which issue(s) this PR fixes:

Fixes #1963

Special notes for your reviewer:

Does this PR introduce a user-facing change?

The timeout unit of the WSClient update method is now always seconds for both poll and select functions.

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: t-yrka (fd13fc8)

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[roycaihw]

/assign @yliaog

[yliaog]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: t-yrka, yliaog

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