fix: state pressure benchmark test (#3203)

fix: increase default CountPerSpammer to prevent empty measurement window

With 2 spammers at 200 tx/s each, the previous default of 2000 txs per
spammer meant all 4000 txs could complete during the 3s init sleep +
warmup phase, leaving the measurement window with only empty blocks.
Increasing to 5000 (10000 total) ensures enough txs remain after warmup.

Author: chatton

test/e2e/benchmark/config.go

@@ -38,7 +38,7 @@ func newBenchConfig(serviceName string) benchConfig {
 		GasLimit:        envOrDefault("BENCH_GAS_LIMIT", ""),
 		ScrapeInterval:  envOrDefault("BENCH_SCRAPE_INTERVAL", "1s"),
 		NumSpammers:     envInt("BENCH_NUM_SPAMMERS", 2),
-		CountPerSpammer: envInt("BENCH_COUNT_PER_SPAMMER", 2000),
+		CountPerSpammer: envInt("BENCH_COUNT_PER_SPAMMER", 5000),
 		Throughput:      envInt("BENCH_THROUGHPUT", 200),
 		WarmupTxs:       envInt("BENCH_WARMUP_TXS", 200),
 		GasUnitsToBurn:  envInt("BENCH_GAS_UNITS_TO_BURN", 1_000_000),