tests/src.ctf.fs: run test_force_origin_unix_epoch succeed test on CTF 1 and CTF...

tests/src.ctf.fs: run test_force_origin_unix_epoch succeed test on CTF 1 and CTF 2 traces

Modify test_force_origin_unix_epoch such that it tests with both the CTF
1 and CTF 2 version of the trace.

Change-Id: I356a2c70c10cab2ab4f182649cbbb93debe86e7e
Signed-off-by: Simon Marchi <simon.marchi@efficios.com>
Reviewed-on: https://review.lttng.org/c/babeltrace/+/8738
Tested-by: jenkins <jenkins@lttng.org>
Reviewed-by: Philippe Proulx <eeppeliteloop@gmail.com>
Reviewed-on: https://review.lttng.org/c/babeltrace/+/12754