NetworkInfo support for IPv6 and dual stack

[poojav25]

The LoadBalancerBackendIPs field was declared in VPCState but never populated. This change wires it up for all three LB paths:

• NSX LB non-TEP-less: read all IPs from ExtendedAttributes["IpAddresses"].Values on the realized interface via new GetPolicyInterfaceIPs helper (both IPv4+IPv6).
• NSX LB TEP-less: best-effort fetch of both _DEFAULT--VPC_SERVICE_IP (IPv4) and _DEFAULT--VPC_SERVICE_IP_V6 (IPv6) allocations; NotFound is silently skipped so VNA-only, VNS-IPv4-only, VNS-IPv6-only, and VNS-dual-stack all work correctly.
• AVI: collect NetworkAddress from every VpcSubnetStatus result (one per IP family for dual-stack) instead of only Results[0].

Testing done:

→ LoadBalancerBackendIPs populated (NSX LB non-TEP-less, CTGW testbed)

kubectl get networkinfo -n test-lb-backend test-lb-backend -o json | \
  python3 -c "
import json, sys
v = json.load(sys.stdin)['vpcs'][0]
print('LoadBalancerIPAddresses:', v.get('loadBalancerIPAddresses',''))
print('LoadBalancerBackendIPs: ', v.get('loadBalancerBackendIPs',[]))
"
LoadBalancerIPAddresses: 100.64.0.1
LoadBalancerBackendIPs:  ['100.64.0.1']

-> NSX API source confirmed — operator reads gateway-interface realized entity:

curl -sku admin:"..." \
  "https://<NSX>/policy/api/v1/infra/realized-state/realized-entity?\
realized_path=/orgs/default/projects/.../realized-state/enforcement-points/\
default/vpcs/test-lb-backend_cmd98/gateway-interface" \
  | python3 -m json.tool | grep -A5 "IpAddresses"
    "key": "IpAddresses",
    "values": [
        "100.64.0.1/31"
    ]

[dantingl]

Can one of the admins verify this patch?

[codecov-commenter]

Codecov Report

❌ Patch coverage is 56.38298% with 41 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.80%. Comparing base (f106c7f) to head (a5ec528).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/nsx/services/vpc/vpc.go	46.15%	20 Missing and 8 partials ⚠️
.../controllers/networkinfo/networkinfo_controller.go	54.16%	2 Missing and 9 partials ⚠️
pkg/nsx/services/realizestate/realize_state.go	87.50%	1 Missing and 1 partial ⚠️

❌ Your patch status has failed because the patch coverage (56.38%) is below the target coverage (70.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1432      +/-   ##
==========================================
- Coverage   77.00%   75.80%   -1.20%     
==========================================
  Files         154      155       +1     
  Lines       21995    22103     +108     
==========================================
- Hits        16938    16756     -182     
- Misses       3854     3868      +14     
- Partials     1203     1479     +276     

Flag	Coverage Δ
unit-tests	75.80% <56.38%> (-1.20%)	⬇️

Files with missing lines	Coverage Δ
pkg/controllers/networkinfo/networkinfo_utils.go	66.51% <100.00%> (-15.18%)	⬇️
pkg/nsx/services/realizestate/realize_state.go	76.47% <87.50%> (+3.39%)	⬆️
.../controllers/networkinfo/networkinfo_controller.go	53.74% <54.16%> (-16.94%)	⬇️
pkg/nsx/services/vpc/vpc.go	53.79% <46.15%> (-19.13%)	⬇️

... and 10 files with indirect coverage changes

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[yanjunz97]

Overall LGTM, just a nit

[yanjunz97]

Maybe remove this function as it is not used any more?