fix(cli/bench): skip strace table border

[marcosc90]

Fixes #16302

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.

deno/test_util/src/lib.rs

Lines 2201 to 2212 in 323ddc8

	let mut lines = output
	.lines()
	.filter(|line| !line.is_empty() && !line.contains("detached ..."));
	let count = lines.clone().count();
	if count < 4 {
	return summary;
	}
	let total_line = lines.next_back().unwrap();
	lines.next_back(); // Drop separator
	let data_lines = lines.skip(2);

[marcosc90]

Found the root cause, the table separator is not skipped correctly because the output begins with:

87381 ????( <unfinished ...>
87358 ????( <detached ...>
% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------

And we're only skipping "detached" line.

[marcosc90]

This line is future proofing, since I do not know all possible strace states that are sometimes present at the beginning of the file, but it seems that all of them contains ????

87381 ????( <unfinished ...>
87358 ????( <detached ...>

[bartlomieju]

LGTM, thanks for digging into this @marcosc90