fix: fallback to API server on missing Node topology key

[ryan-mist]

What type of PR is this?
/kind bug

What this PR does / why we need it:e
This PR adds a fallback to the API server in Node Topology if the topology labels on the Node do not match the labels on the CSINode.

This fixes a bug where during provisioning, if the Node does not yet have all topology labels then provisioning continually fails. Even when the Node eventually does have all the labels.

Testing After Fix

1. Launch Node
   In this case, I use EKS Auto to launch the Node. There are 4 required topology labels are:

eks.amazonaws.com/compute-type
kubernetes.io/os
topology.ebs.csi.eks.amazonaws.com/zone
topology.kubernetes.io/zone

2. Remove A Required Topology Label From The Node

k label node {NODE_LABEL} eks.amazonaws.com/compute-type-

3. Create Stateful Set with volumeClaimTemplate so PVC created and volume provisioned
   Looking at the PVC events

Warning  ProvisioningFailed    40s (x7 over 103s)     ebs.csi.eks.amazonaws.com_ebscsicontroller-7b864487cb-dgx8v_07b290e6-86d7-4bb5-a604-410cd0ef97ba  error generating accessibility requirements: topology labels from selected node map[] does not match topology keys from CSINode [eks.amazonaws.com/compute-type kubernetes.io/os topology.ebs.csi.eks.amazonaws.com/zone topology.kubernetes.io/zone]

4. Add Label Back Onto The Node

k label node i-096987243751a321d eks.amazonaws.com/compute-type=auto

5. PVC Should Be Bound Soon After

NAME                     STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS   VOLUMEATTRIBUTESCLASS   AGE
data-my-stateful-app-0   Bound    pvc-a733f911-6d1a-4e30-9c8d-8f249b465ea5   8Gi        RWO            auto-ebs-sc    <unset>                 4m37s
data-my-stateful-app-1   Bound    pvc-6b8dac92-770e-4ba6-ae0c-c2f57dbd833e   8Gi        RWO            auto-ebs-sc    <unset>                 7s

Before this new version of external provisioner, PVCs would remain unbound with provisioning failures of:

error generating accessibility requirements: topology labels from selected node map[] does not match topology keys from CSINode

Which issue(s) this PR fixes:

Fixes #1478

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

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[jsafrane]

/ok-to-test

[Copilot]

Pull request overview

This PR addresses a topology-provisioning failure mode where stale/incomplete cached Node labels can cause repeated provisioning errors even after the Node later gains the missing topology labels, by falling back to re-reading Node labels when cached labels are missing required topology keys.

Changes:

• Adjust getTopologyFromNodeName to fall back to fetching Node labels (via the lister) when cached Node labels are missing required topology keys.
• Update extractTopologyTerm to return the available label map on missing-key errors (improves error context).
• Add a regression test that reproduces “initially missing label, later added label” behavior and validates successful provisioning on retry.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
pkg/controller/topology.go	Adds cache-miss-on-missing-keys fallback and preserves label context when topology keys are missing.
pkg/controller/topology_test.go	Adds a unit test covering the missing-label-then-added-label retry scenario.

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[jsafrane]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jsafrane, ryan-mist

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[msau42]

/cherry-pick release-6.2

[k8s-infra-cherrypick-robot]

@msau42: new pull request created: #1516

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/cherry-pick release-6.2

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[msau42]

/cherry-pick release-6.1

[k8s-infra-cherrypick-robot]

@msau42: new pull request created: #1517

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/cherry-pick release-6.1

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[msau42]

/cherry-pick release-6.0

[k8s-infra-cherrypick-robot]

@msau42: new pull request created: #1518

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In response to this:

/cherry-pick release-6.0

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