src.ctf.lttng-live: add detailed error reporting for late msg

src.ctf.lttng-live: add detailed error reporting for late msg

The only scenario in which it's okay and fixable to received a late
message is when:
  1. the late message is a discarded packets or discarded events
    message,
  2. this component sent am inactivity message downstream, and
  3. the timestamp of the late message is within the inactivity timespan
    we sent downstream through the inactivity message.

Signed-off-by: Francis Deslauriers <francis.deslauriers@efficios.com>
Change-Id: I46ec383bffdce237fb18590354bbe2d64374ff3e
Reviewed-on: https://review.lttng.org/c/babeltrace/+/6698
Tested-by: jenkins <jenkins@lttng.org>
Reviewed-by: Philippe Proulx <eeppeliteloop@gmail.com>