[Prism] Set keepalive policy for grpc server.

[shunping]

After the changes in FnApiRunner grpc server setting (#37013), one test is still flaky due to too-many-ping grpc error(https://github.com/apache/beam/actions/runs/19973942914/job/57285283120).

It seems that this test is running with prism (verified in a debugging PR #37020): https://github.com/apache/beam/actions/runs/19981955990/job/57309934542?pr=37020

This PR is to change the options of Prism grpc server, so it won't complain about the ping frequency of the client.

Notice that the default min ping frequency in the server option is 5 mins (https://pkg.go.dev/google.golang.org/grpc@v1.77.0/keepalive#EnforcementPolicy)

[gemini-code-assist]

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 enhances the robustness of the Prism gRPC server by implementing a keepalive enforcement policy. This policy ensures that client connections remain active and are not prematurely terminated by network intermediaries, which is crucial for the stability and reliability of job management services. The changes specifically set a minimum ping interval and allow pings on idle connections.

Highlights

• gRPC Keepalive Policy: Introduced a keepalive enforcement policy for the Prism gRPC server to maintain stable connections.
• Minimum Keepalive Time: Configured the minimum time a client should wait before sending a keepalive ping to 20 seconds.
• Permit Pings Without Streams: Enabled the gRPC server to permit keepalive pings even when there are no active streams, preventing idle connection closures.

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[shunping]

The 20-second min time matches the option set in the python client:

https://github.com/liferoad/beam/blob/782a0e7cc26e582c31534253fa5a00018bce4c38/sdks/python/apache_beam/runners/worker/channel_factory.py#L27

[github-actions]

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[shunping]

Failure of PreCommit Java PVR Prism Loopback seems to be related to #36897.

[github-actions]

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