chore: remove deprecated rand.Seed

[YurDuiachenko]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

Removes the deprecated top-level rand.Seed call from cloud-controller-manager and node-manager startup.

The project builds with a modern Go version, where the global math/rand generator is already auto-seeded, so the explicit rand.Seed(...) call is no longer needed.

Which issue(s) this PR fixes:

NONE

Special notes for your reviewer:

This is a cleanup-only change and does not change runtime behavior.
rand.Float64() is still used for resync jitter and continues to work as expected without an explicit seed.

Does this PR introduce a user-facing change?

NONE

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: YurDuiachenko
Once this PR has been reviewed and has the lgtm label, please assign nilo19 for approval. For more information see the Code Review Process.

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[k8s-ci-robot]

Hi @YurDuiachenko. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work.

Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[YurDuiachenko]

/release-note-none

[YurDuiachenko]

/assign nilo19