src.ctf.fs: make ctf_fs_component::port_data a vector

src.ctf.fs: make ctf_fs_component::port_data a vector

Replace a GPtrArray with a vector of unique pointers of
ctf_fs_port_data, simplifying memory management.

Change-Id: I4f832f32b0ca893242cc3e61e8aaac495fe86003
Signed-off-by: Simon Marchi <simon.marchi@efficios.com>
Reviewed-on: https://review.lttng.org/c/babeltrace/+/8243
Reviewed-by: Philippe Proulx <eeppeliteloop@gmail.com>
Reviewed-on: https://review.lttng.org/c/babeltrace/+/12283