kubernetes-sigs / cloud-provider-azure / 22745773086 / 1
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[release-1.32]feat: implement tagsList-based Interconnect Group ID retrieval from IMDS (#10012)

* Label node with Interconnect Group ID (placeholder implementation)

What type of PR is this?
/kind feature

What this PR does / why we need it:
This adds the infrastructure/plumbing code for Interconnect Group node labeling but with a placeholder implementation that returns empty string. This allows the infrastructure to be in place and tested without breaking anything, while the actual IMDS parsing implementation can be added later when the format is finalized.

Which issue(s) this PR fixes:
N/A (New feature - infrastructure preparation)

Special notes for your reviewer:
Changes:
- pkg/consts: Add LabelInterconnectGroup constant
- pkg/provider: Add GetInterconnectGroupId method (returns empty)
- pkg/nodemanager: Add GetInterconnectGroupId to interface and integration code
- pkg/node: Implement GetInterconnectGroupId for both IMDS and ARM providers (both return empty)
- pkg/provider: Add minimal unit test

Behavior:
- GetInterconnectGroupId() always returns ("", nil)
- No label is applied to nodes
- No errors, nothing breaks
- Infrastructure is ready for future implementation

This approach allows:
1. Code review and testing of the infrastructure separately
2. Future IMDS parsing logic to be added without modifying the interface
3. Safe deployment - guaranteed not to break anything
4. No assumptions about IMDS format (no TagsList or other structures added)

Does this PR introduce a user-facing change?
NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:
NONE

* Implement TagsList-based Interconnect Group ID retrieval from IMDS

This commit implements the actual IMDS parsing logic to retrieve the
Platform Interconnect Group ID from Azure instance metadata using the
tagsList field.

Implementation changes:
- Add TagNameInterconnectGroup constant for the IMDS tag name
- Add Tag struct to represent IMDS tag key-valu... (continued)

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Source Files on job 22745773086.1