e2e: fixed flaky test_id:32646 CPU load balancing on cgroupv1

[SargunNarula]

The test was flaky because it checked /proc/schedstat immediately after pod startup, before kubelet had time to reconcile system pod cpusets. This race window caused intermittent failures where load balancing appeared still enabled on the Guaranteed pod's CPUs.

On cgroupv1 systems, disabling CPU load balancing requires ALL cgroups that intersect with a CPU to have sched_load_balance=0.

[openshift-ci]

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This pull-request has been approved by: SargunNarula
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[openshift-ci]

@SargunNarula: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-hypershift	5f3719d	link	true	/test e2e-hypershift

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