Add new extended resources test cases

[bart0sh]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

Added unit tests for extended resource handling in kubelet lifecycle predicates
and scheduler admission checks:

• kubelet lifecycle: Test that extended resources with zero Allocatable are
  not removed, and resources missing from node Allocatable are filtered from
  pod requests

• scheduler admission: Test that missing extended resources cause admission
  failures by default, and are allowed when DRAExtendedResource feature gate
  is enabled (for Dynamic Resource Allocation scenarios)

Which issue(s) this PR is related to:

#135669

Special notes for your reviewer:

I added these test cases while investigating #135669 and found them useful enough to justify creating a PR.

Does this PR introduce a user-facing change?

NONE

/sig node
/cc @yliaog

[k8s-ci-robot]

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[k8s-ci-robot]

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[k8s-ci-robot]

@bart0sh: The following test 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-dra-integration	99b3cdd	link	false	/test pull-kubernetes-dra-integration

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: bart0sh
Once this PR has been reviewed and has the lgtm label, please assign kerthcet, tallclair for approval. For more information see the Code Review Process.

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[bart0sh]

/cc @pohly

[yliaog]

is this the same as the test at line 81: "requests for resources unavailable in node should be removed" ?