chore: use new api in Session::remove_credential

Author: coriolinus

crypto/src/mls/session/credential.rs

@@ -1,7 +1,6 @@
 use std::sync::Arc;
 
 use openmls::prelude::{SignaturePublicKey, SignatureScheme};
-use openmls_traits::OpenMlsCryptoProvider as _;
 
 use super::{Error, Result};
 use crate::{
@@ -143,16 +142,7 @@ impl Session {
         }
 
         // remove any key packages generated by this credential
-        let keypackages = self.find_all_keypackages(&self.crypto_provider.keystore()).await?;
-        let keypackages_from_this_credential = keypackages.iter().filter_map(|(_stored_key_package, key_package)| {
-            credentials
-                    .iter()
-                    .any(|credential| key_package.leaf_node().credential() == credential.mls_credential())
-                    // if computing the hash reference fails, we will just not delete the key package
-                    .then(|| key_package.hash_ref(self.crypto_provider.crypto()).ok()).flatten()
-        });
-        self.prune_keypackages(&self.crypto_provider, keypackages_from_this_credential)
-            .await?;
+        self.remove_keypackages_for(credential_ref).await?;
 
         // remove all credentials associated with this ref
         // only remove the actual credential after the keypackages are all gone,