Create a test util function for asserting `admissionCheckState`

[PBundyra]

What would you like to be cleaned:
Create a test util function that with a header along the lines:

func ExpectAdmissionCheckState(wlKey kueue.Workload, acName string, expectedState kueue.CheckState, expectedMessage string)

that asserts if a Workload has admission check with desired fields

The function should be used across the codebase, especially in test/integration/singlecluster/controller/admissionchecks/provisioning/provisioning_test.go

Why is this needed:
Context: https://github.com/kubernetes-sigs/kueue/pull/6408/files#r2251649819
To make test more readable and robust

[mimowo]

cc @olekzabl