fix(cache): remove stale service address indexes

[sivakumar-mahalingam]

What type of PR is this?

/kind bug

What this PR does / why we need it:

Cleans up address indexes belonging to the previous version of a service before indexing an updated service. This prevents removed addresses from continuing to resolve through servicesByAddr or servicesByIP while preserving addresses reassigned to another service.

Adds regression tests covering stale index removal and address reassignment.

Which issue(s) this PR fixes:

Fixes #1954

Special notes for your reviewer:

The update path reuses the existing deleteAddr ownership checks. Tests cover both network-address and IP-only lookups.

Does this PR introduce a user-facing change?:

Yes.

Fixed stale service address lookups after a service's addresses are updated.

[kmesh-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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Details

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• pkg/controller/OWNERS

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 39.72%. Comparing base (09e96d3) to head (de5ec90).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Coverage Δ
pkg/controller/workload/cache/service_cache.go	83.92% <100.00%> (+9.41%)	⬆️

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[sivakumar-mahalingam]

The Istio 1.27 IPv6 E2E check failed in TestMixNsAndServiceWaypoint because X-Request-Id was missing. The same test passed on the preceding run with identical code. Could a maintainer rerun the failed job?