Cherrypick #37013 #37021 to Release 2.70

[shunping]

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Summary of Changes

Hello @shunping, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request cherry-picks two changes to the Release 2.70 branch, primarily focusing on improving the robustness of gRPC communication within the Apache Beam SDKs. It introduces and synchronizes keepalive policies between the Go-based Prism runner's job services server and the Python portability runner's worker handlers, ensuring consistent handling of idle connections and preventing premature disconnections across the system.

Highlights

• Go gRPC Server Keepalive Policy: The Go gRPC server in the Prism runner's job services now enforces a keepalive policy, requiring clients to send pings at least every 20 seconds and permitting pings even when no active streams are present. This enhances connection stability.
• Python gRPC Client Keepalive Synchronization: The Python portability runner's worker handlers have been updated to include a gRPC option that sets the minimum HTTP/2 ping interval to 20 seconds. This change synchronizes the client-side keepalive settings with the server-side policy.

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[shunping]

R: @Amar3tto

[github-actions]

Stopping reviewer notifications for this pull request: review requested by someone other than the bot, ceding control. If you'd like to restart, comment assign set of reviewers

[damccorm]

Thanks!