test_gi: Enable GBytes test cases
test_gi: Enable GBytes test cases

GBytes annotations are fixed in GLib now, enable the test case and add more
for g_bytes_new_take() and g_bytes_{compare,equal}().

Please note that calling unref_to_array() on a GBytes object that we created
ourselves currently causes a double free crash, so disable that part for now.

GNOME/pygobject,davibe/pygobject,davibe/pygobject,pexip/pygobject,sfeltman/pygobject,pexip/pygobject,pexip/pygobject,GNOME/pygobject,sfeltman/pygobject,davibe/pygobject,GNOME/pygobject,sfeltman/pygobject,davibe/pygobject