In general change the filter priority in your code snippet so it runs after the plugin has modified the row action, e.g. 99 or later and check out the $actions with e.g.
print_r( $actions );
on your test install to find the key or search the plugin code for page_row_actions.
In some cases one should be able to remove the page_row_actions filter callback with remove_filter(), but some plugins make it harder.
ps: I think you’re looking for the edit_vc row action key.