[release-2.5] 🐛 ROSA: fix ROSAMachinePool changes detection logic

[k8s-infra-cherrypick-robot]

This is an automated cherry-pick of #4977

/assign muraee

Fix ROSAMachinePool changes detection logic

[damdo]

/test ?

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[muraee]

/lgtm

[damdo]

/lgtm

/assign @dlipovetsky @enxebre

[muraee]

/approve

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