Remove fetch_value issue logging

Since we've moved back to Ruby 3.1.3 in 9aa172f7df and the issue only occurs on Ruby 3.2.1 due to the marshaller changing the ordering of instance variables, as explained by byroot / casperisfine in https://github.com/mastodon/mastodon/issues/23644#issuecomment-1472637530.

As such, we no longer need this logging, and should be able to upgrade past Ruby 3.1 once the marshaller does ordering correctly again or Rails is changed to do custom marshalling.

app/controllers/concerns/cache_concern.rb

@@ -34,25 +34,7 @@ module CacheConcern
     raw = raw.cache_ids.to_a if raw.is_a?(ActiveRecord::Relation)
     return [] if raw.empty?
 
-    cached_keys_with_value = begin
-      Rails.cache.read_multi(*raw).transform_keys(&:id)
-    rescue NoMethodError
-      culprit = raw.find do |item|
-        Rails.cache.read(item)
-        false
-      rescue NoMethodError
-        true
-      end
-
-      Rails.logger.warn "culprit: #{culprit.inspect}"
-
-      cache_key = Rails.cache.send(:normalize_key, culprit, {})
-      entry = Rails.cache.send(:read_entry, cache_key)
-      raw_marshal = Zlib::Inflate.inflate(entry.instance_variable_get(:@value))
-      Rails.logger.warn "base64 marshal: #{Base64.encode64(raw_marshal)}"
-      raise
-    end
-
+    cached_keys_with_value = Rails.cache.read_multi(*raw).transform_keys(&:id)
     uncached_ids           = raw.map(&:id) - cached_keys_with_value.keys
 
     klass.reload_stale_associations!(cached_keys_with_value.values) if klass.respond_to?(:reload_stale_associations!)