collect error return traces from errors other than error.MakeFailed

[andrewrk]

Extracted from #14647.

zig/lib/std/Build/Step.zig

Lines 166 to 169 in b4d58e9

	else => {
	s.result_error_msgs.append(arena, @errorName(err)) catch @panic("OOM");
	return error.MakeFailed;
	},

Here it should capture an error return trace and include it as part of the result's error messages.