[NET-6295] Backport of Add grpc keepalive configuration. (#19339) #19355
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Prior to the introduction of this configuration, grpc keepalive messages were sent after 2 hours of inactivity on the stream. This posed issues in various scenarios where the server-side xds connection balancing was unaware that envoy instances were uncleanly killed / force-closed, since the connections would only be cleaned up after ~5 minutes of TCP timeouts occurred. Setting this config to a 30 second interval with a 20 second timeout ensures that at most, it should take up to 50 seconds for a dead xds connection to be closed.
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Manual backport of #19339