Add sticker manager in non admin section of admin api test client

extra/admin-api/Utilities/Spacebar.AdminApi.TestClient/Services/StreamingHttpClient.cs

@@ -282,9 +282,9 @@ public class StreamingHttpClient {
         return await SendAsync(request, cancellationToken);
     }
 
-    public async Task DeleteAsync(string url) {
+    public async Task<HttpResponseMessage> DeleteAsync(string url) {
         var request = new HttpRequestMessage(HttpMethod.Delete, url);
-        await SendAsync(request);
+        return await SendAsync(request);
     }
 
     public async Task<HttpResponseMessage> DeleteAsJsonAsync<T>(string url, T payload) {
@@ -293,5 +293,12 @@ public class StreamingHttpClient {
         };
         return await SendAsync(request);
     }
+
+    public async Task<HttpResponseMessage> PatchAsJsonAsync<T>(string url, T payload) {
+        var request = new HttpRequestMessage(new HttpMethod("PATCH"), url) {
+            Content = new StringContent(JsonSerializer.Serialize(payload), Encoding.UTF8, "application/json")
+        };
+        return await SendAsync(request);
+    }
 }
 #endif