In case `library_foreach_ID_link` would return early in recursive
process, it would not properly free its utils data.
Also add proper iteration break in case some sub-calls requested it.
Finally, make this function return a boolean to know whether iteration
should be stopped or not (will be used in future commit to fix this
handling in embedded IDs case).
Part of T90922: Fix return policy inconsistency in `scene_foreach_id`.
259731909c