OverlayV2: Add metrics for tracking tx e2e latency#5330
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Add per-node metrics for tracking tx e2e latency. The metrics are gated behind the config flag
LOADGEN_MEASURE_TX_LATENCY_FOR_TESTINGand are split into two kinds: per-run and cumulative. The per-run metrics are only updated at the successful completion of a loadgen run (so that there's one overall number we can use as a P50/75/99, etc...), while the cumulative numbers use a Medida timer (for more granular monitoring).