Fix issue of kubectl logs with flag --since-time

[fenglixa]

What type of PR is this?
/kind bug

What this PR does / why we need it:

• What this PR does:
  Change RFC3339 to RFC3339Nano in time.go to ensure nanosecond support.
• why we need it:

1. In util.go, actually we already coded for supporting RFC3339 Nanosecond, but in time.go, the code missed the Nano supporting which caused this issue.
2. docker command with flag --since has no such issue.

Which issue(s) this PR fixes:
Fixes #77856

Special notes for your reviewer:
we don't need to modify "time.Parse(time.RFC3339, str)" in time.go, as from my test result. Parse function won't lost the milliseconds, only Format func will.

UT test PASS for this case with the code changes.

/sig cli

BR
-Francis

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: fenglixa
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We suggest the following additional approver: lavalamp

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[fenglixa]

/release-note-none
/priority important-soon

[fejta-bot]

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[fenglixa]

@wojtek-t @soltysh Could you help review this PR? Thanks very much.

[fenglixa]

/assign @lavalamp

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/lifecycle stale

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