apollo_network_benchmark: add seconds_since_epoch helper function

[sirandreww-starkware]

Note

Low Risk
Adds a small utility function and adjusts imports in a benchmark binary; minimal behavioral impact aside from potential panic if system time is before the Unix epoch.

Overview
Adds seconds_since_epoch() to broadcast_network_stress_test_node/metrics.rs to expose the current Unix timestamp in seconds (via SystemTime/UNIX_EPOCH). Updates the module’s std::time imports accordingly; no other benchmark/metrics logic changes.

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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 👈 (View in Graphite)
• 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
• 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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[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

[cursor]

New exported function seconds_since_epoch is unused

Low Severity

The newly added pub fn seconds_since_epoch() has no callers anywhere in the codebase. A grep for seconds_since_epoch returns only the definition itself. If this is intended for a downstream PR in the stack, it may be better to introduce it together with its usage to avoid dead code in the interim.