Fire an action before setting object terms during a GraphQL Post Object Mutation. One example use for this hook would be to create terms from the input that may not exist yet, so that they can be set as a relation below.
- $post_id (int): Inserted post ID
- $input (array): The input for the mutation
- $post_type_object (WP_Post_Type): The Post Type object for the post being mutated
- $mutation_name (string): The name of the mutation being performed