tests/lib: pass C++ wrapper types to `RunIn` callbacks

tests/lib: pass C++ wrapper types to `RunIn` callbacks

Pass C++ wrapper types to `RunInCompClsInitFunc`,
`RunInCompClsQueryFunc` and `RunInMsgIterClsInitFunc` instead of C
library types.

Adjust callers and callees in a trivial way.

Change-Id: I3d6fcee8e0239976483995affcd7e95fb5fa12ef
Signed-off-by: Simon Marchi <simon.marchi@efficios.com>
Reviewed-on: https://review.lttng.org/c/babeltrace/+/11796
Reviewed-by: Philippe Proulx <eeppeliteloop@gmail.com>
Tested-by: jenkins <jenkins@lttng.org>