Trim run id

Author: nblumhardt

src/SeqCli/Cli/Commands/Bench/BenchCommand.cs

@@ -108,7 +108,7 @@ protected override async Task<int> Run()
             var seqVersion = (await connection.Client.GetRootAsync()).Version;
 
             var cases = ReadCases(_cases);
-            var runId = Guid.NewGuid().ToString("N");
+            var runId = Guid.NewGuid().ToString("N")[..16];
 
             await using var reportingLogger = BuildReportingLogger();