ACP-53164 Add Envoy Gateway header migration notes

[woodgear]

Summary

• Add migration guidance for ALB / ingress-nginx header-based affinity.
• Clarify that request header hashing maps to BackendTrafficPolicy consistent hash by header, not HTTPRoute.rules[].sessionPersistence.type: Header.
• Add Envoy Gateway underscore-header handling guidance with ClientTrafficPolicy.spec.withUnderscoresAction.

Verification

• git diff --check
• rg -n "frontend-plugins|marketplace|cpaas-system|cluster-proxy|apollo|erebus|192\\.168|business-1|console-plugins|TODO|TBD|FIXME|REPLACEME|changeme" docs/en/solutions/How_to_Migrate_Ingress_to_Gateway_API_with_Envoy_Gateway_on_ACP.md; test $? -eq 1

Note

• yarn build was started but interrupted by user request to proceed with PR, so it is not listed as a passing verification for this follow-up PR.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

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Run ID: 79908d92-65d8-453f-afa7-c8349037b420

📥 Commits

Reviewing files that changed from the base of the PR and between 746e20f and 3c5e06f.

📒 Files selected for processing (1)

• docs/en/solutions/How_to_Migrate_Ingress_to_Gateway_API_with_Envoy_Gateway_on_ACP.md

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🧪 Generate unit tests (beta)

• Create PR with unit tests

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