Remove unused corpora #249

1. 
   marcofleon commented at 3:30 pm on December 23, 2025: contributor

   Removes the inputs for targets that we no longer have in bitcoin core: mini_miner_selection, clusterlin_ancestor_finder, clusterlin_linearization_chunking, clusterlin_merge, clusterlin_search_finder.
2. Remove unused corpora 645cac3186
3. 
   maflcko commented at 6:50 pm on December 23, 2025: contributor

   thx, but this is normally only done right before branch-off as part of #239#issue-3391676198 (see the comment for more context)

   Otherwise, fuzz coverage for v30.x will decrease.

Contributors
marcofleon maflcko