apollo_network_benchmark: added conditional broadcasting based on mode

[sirandreww-starkware]

Note

Low Risk
Low risk benchmark-only behavior change that gates message sending on mode and may alter load characteristics; failures are limited to the stress test harness (with an explicit panic if --broadcaster is missing in one mode).

Overview
Adds mode-aware broadcasting to the broadcast network stress test node: in all mode every node sends messages, while in one mode only the configured --broadcaster node starts the sender task.

start_message_sender now returns Option<BoxFuture<()>> and get_tasks only spawns the sender when applicable, with additional logging to make per-node broadcast behavior explicit.

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[reviewable-StarkWare]

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[sirandreww-starkware]

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• apollo_network_benchmark: implement RoundRobin broadcasting logic #11560 : 3 dependent PRs (#11561 , #12722 , #13288 )
• apollo_network_benchmark: add seconds_since_epoch helper function #11559
• apollo_network_benchmark: add RoundRobin mode to enum and round_duration_seconds arg #11558
• apollo_network_benchmark: add message index detection mechanism #11557
• apollo_network_benchmark: add MessageIndexTracker struct #11556
• apollo_network_benchmark: add ReveresedSqmr receiver and registration #11555
• apollo_network_benchmark: add ReveresedSqmrSender struct and implementation #11554
• apollo_network_benchmark: add ReveresedSqmr variant to NetworkProtocol enum #11553
• apollo_network_benchmark: add Sqmr variant to MessageReceiver and registration #11552
• apollo_network_benchmark: add Sqmr variant to MessageSender with send logic #11551
• apollo_network_benchmark: add Sqmr variant to NetworkProtocol enum #11550
• apollo_network_benchmark: add SQMR protocol constant #11549
• apollo_network_benchmark: added ping latency metrics #11548
• apollo_network_benchmark: added network event metrics #11547
• apollo_network_benchmark: added SQMR session metrics #11546
• apollo_network_benchmark: added broadcast topic metrics #11545
• apollo_network_benchmark: added network metrics to network manager #11544
• apollo_network_benchmark: added broadcast metrics tracking #11543
• apollo_network_benchmark: added conditional broadcasting based on mode #11542 👈 (View in Graphite)
• apollo_network_benchmark: added broadcasting mode selection #11541
• apollo_network_benchmark: added message broadcasting task #10734 : 1 other dependent PR (#8303 )
• apollo_network_benchmark: added register metrics #10660 : 1 other dependent PR (#10661 )
• main

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