fix: Client features were not refreshing. (#79)

We incorrectly assumed that our merge method would be enough here, but
since the merge method retained the original and deduped, it seems like
we tricked ourselves. The fix reduces the action to simply replacing
whatever was cached with the newly fetched features from the server

server/src/data_sources/memory_provider.rs

@@ -4,7 +4,6 @@ use actix_web::http::header::EntityTag;
 use async_trait::async_trait;
 use dashmap::DashMap;
 use unleash_types::client_features::ClientFeatures;
-use unleash_types::Merge;
 
 use super::repository::{DataSink, DataSource};
 
@@ -77,12 +76,7 @@ impl DataSink for MemoryProvider {
     }
 
     async fn sink_features(&self, token: &EdgeToken, features: ClientFeatures) -> EdgeResult<()> {
-        self.data_store
-            .entry(key(token))
-            .and_modify(|data| {
-                *data = data.clone().merge(features.clone());
-            })
-            .or_insert(features);
+        self.data_store.insert(key(token), features);
         Ok(())
     }