fix: clear more references to removed files

Author: richardhuaaa

ts/index.ts

@@ -18,9 +18,7 @@ export * as signedPayload from "./message_contents/signed_payload.pb";
 export * as ecies from "./message_contents/ecies.pb";
 export * as mlsApi from "./mls/api/v1/mls.pb";
 export * as mlsDatabaseIntent from "./mls/database/intents.pb";
-export * as mlsAssociation from "./mls/message_contents/association.pb";
 export * as mlsContent from "./mls/message_contents/content.pb";
-export * as mlsCredential from "./mls/message_contents/credential.pb";
 export * as mlsGroupMembership from "./mls/message_contents/group_membership.pb";
 export * as mlsGroupMetadata from "./mls/message_contents/group_metadata.pb";
 export * as mlsGroupMutableMetadata from "./mls/message_contents/group_mutable_metadata.pb";