[release-0.10] cleanup scheduler.go

[k8s-infra-cherrypick-robot]

This is an automated cherry-pick of #4108

/assign tenzen-y

Renamed Log key from "attemptCount" to "schedulingCycleCount". This key tracks how many scheduling cycles we have done since starting Kueue.

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[tenzen-y]

/lgtm
/approve

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 755f8ae0ed4b139758f69cb67e13dcaa8795243f

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: k8s-infra-cherrypick-robot, tenzen-y

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[mimowo]

/kind cleanup