chore: remove clear_layer_data() and clear_caches() functions

`clear_layer_data()` and `clear_caches()` arent't used within `rust-fil-proofs`
or `rust-filecoin-proofs-api`, hence remove them.

filecoin-proofs/src/api/mod.rs

@@ -64,36 +64,6 @@ pub fn clear_cache<Tree>(cache_dir: &Path) -> Result<()> {
     result
 }
 
-// TODO vmx 2023-09-26: The `Tree` generic is not needed, it's only there in order to not breaking
-// the public API. Once we break the API, remove that generic.
-// Ensure that any associated cached data persisted is discarded.
-pub fn clear_caches<Tree: MerkleTreeTrait>(
-    replicas: &BTreeMap<SectorId, PrivateReplicaInfo<Tree>>,
-) -> Result<()> {
-    info!("clear_caches:start");
-
-    for replica in replicas.values() {
-        clear_cache::<Tree>(replica.cache_dir.as_path())?;
-    }
-
-    info!("clear_caches:finish");
-
-    Ok(())
-}
-
-// TODO vmx 2023-09-26: The `Tree` generic is not needed, it's only there in order to not breaking
-// the public API. Once we break the API, remove that generic.
-// Ensure that any persisted layer data generated from porep are discarded.
-pub fn clear_layer_data<Tree>(cache_dir: &Path) -> Result<()> {
-    info!("clear_layer_data:start");
-
-    let result = stacked::clear_cache_dir(cache_dir);
-
-    info!("clear_layer_data:finish");
-
-    result
-}
-
 // TODO vmx 2023-09-26: The `Tree` generic is not needed, it's only there in order to not breaking
 // the public API. Once we break the API, remove that generic.
 // Ensure that any persisted vanilla proofs generated from synthetic porep are discarded.