dra extended resources scheduler: add unit test to prove why sorting extended resources is required

[alaypatel07]

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This pull-request has been approved by: alaypatel07
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[k8s-ci-robot]

@alaypatel07: 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-kubernetes-unit	4dd83d4	link	true	/test pull-kubernetes-unit
pull-kubernetes-verify	4dd83d4	link	true	/test pull-kubernetes-verify

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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