Manual Backport of PR 23454 to release/1.21.x#23502

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abhishek/api-gw-fix-backport1.21.x

Commits on Apr 22, 2026

Fixed XDS package to generate correct endpoints and cluster config for API Gateways when peered and updated the API Gateway updateHandler to propagate mesh gateway config to its upstreams. (#23454)
LordAbhishek
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