Revert "Sch: Disable CHUNK_CACHE evictions for now"

This reverts commit 6a96fd5.

Author: JamesWrigley

src/sch/Sch.jl

@@ -935,7 +935,7 @@ function finish_task!(ctx, state, node, thunk_failed)
     if haskey(state.waiting_data, node) && isempty(state.waiting_data[node])
         delete!(state.waiting_data, node)
     end
-    #evict_all_chunks!(ctx, to_evict)
+    evict_all_chunks!(ctx, to_evict)
 end
 
 function delete_unused_tasks!(state)