fix(cli/bench): skip strace table border (#16310)
It crashes due to the table border output from `strace`,
```
% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ---------------- # this is skipped correctly
61.27 6.012053 678 8860 637 futex
0.00 0.000000 0 4 geteuid
------ ----------- ----------- --------- --------- ---------------- # this causes the crash
100.00 11.732230 25552 1205 total
```
It's flaky because that line is not always skipped from the output, for
some reason that I've yet to find out.
