Update logger config and fix warning

Author: solnic

config/config.exs

@@ -13,7 +13,15 @@ if config_env() == :test do
     test_mode: true,
     traces_sample_rate: 1.0
 
-  config :logger, backends: []
+  config :logger, :default_handler, false
+
+  config :sentry, :logger, [
+    {:handler, :file_log, :logger_std_h,
+     %{
+       config: %{file: ~c"log/tests.log"},
+       formatter: Logger.Formatter.new()
+     }}
+  ]
 
   config :opentelemetry, span_processor: {Sentry.OpenTelemetry.SpanProcessor, []}