[cluster-autoscaler-release-1.30] Refactor Provisioning Request orchestrator unit tests

[k8s-infra-cherrypick-robot]

This is an automated cherry-pick of #6779

/assign yaroslava-serdiuk

NONE

[yaroslava-serdiuk]

/assign @towca

[Shubham82]

/lgtm

[Shubham82]

cc Hi, @towca
Could you please approve this PR, so that it can be merged

Thanks!

[yaroslava-serdiuk]

The essential changes that should be cherry-picked were introduced in #6821, #6873.
Actually this PR is not needed to be cherry-picked in order to cherry-pick real changes, so it could be abandon. Sorry for not verifying it initially.

[yaroslava-serdiuk]

/close

[k8s-ci-robot]

@yaroslava-serdiuk: Closed this PR.

In response to this:

/close

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[yaroslava-serdiuk]

/reopen

[k8s-ci-robot]

@yaroslava-serdiuk: Reopened this PR.

In response to this:

/reopen

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[yaroslava-serdiuk]

@x13n reopen this PR since it's needed to cherry-pick #6824

[x13n]

/lgtm
/approve

[k8s-ci-robot]

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