[release-0.14] Update PriorityClass only for WorkloadPriorityClassSource.

[k8s-infra-cherrypick-robot]

This is an automated cherry-pick of #7299

/assign mimowo

Fixed a bug that Kueue would keep sending empty updates to a Workload, along with sending the "UpdatedWorkload" event, even if the Workload didn't change. This would happen for Workloads using any other mechanism for setting
the priority than the WorkloadPriorityClass, eg. for Workloads for PodGroups.

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[mimowo]

/kind bug
/lgtm
/approve

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 2fbd85f03d13a690c4aeaab8c6acf5b3cbeeafc1

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[k8s-ci-robot]

@k8s-infra-cherrypick-robot: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-kueue-verify-release-0-14	77a9aa0	link	true	/test pull-kueue-verify-release-0-14
pull-kueue-test-unit-release-0-14	77a9aa0	link	true	/test pull-kueue-test-unit-release-0-14

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[mimowo]

@mbobrovskyi please prepare manually

[mimowo]

/close

[k8s-ci-robot]

@mimowo: Closed this PR.

In response to this:

/close

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