Remove hardcoded execution count in benchmark functions

[nu1lspaxe]

Description

Found staticcheck SA3001 violation in rawnode_test.go :

func benchmarkRawNodeImpl(b *testing.B, peers ...uint64) {
        // ...
	if debug {
		b.N = 1
	}
        // ...
}

Proposed Fix

Instead of hardcoding b.N in the function body, the execution count should be controlled via the go test command, e.g.:

go test -bench=BenchmarkRawNodeImpl -benchtime=1x

Impact

This change ensures benchmark results are accurate and aligns with Go's testing best practices.