docs: add graceful pod shutdown guide

[woodgear]

• Pod termination flow and EndpointSlice update behavior
• Gateway traffic propagation latency
• Envoy Gateway drainTimeout/minDrainDuration defaults
• Application SIGTERM handling and PID 1 signal forwarding
• preStop fallback and drain for long-lived connections
• Client retry and preStop sleep compatibility notes

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Reviewing files that changed from the base of the PR and between da3a5ae and c880b39.

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• docs/en/solutions/How_to_Implement_Graceful_Pod_Shutdown.md

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