Rename `app_server?` to `web_server?`

config/initializers/7_prometheus_metrics.rb

@@ -58,7 +58,7 @@ if !Rails.env.test? && Gitlab::Metrics.prometheus_metrics_enabled?
   end
 end
 
-if Gitlab::Runtime.app_server?
+if Gitlab::Runtime.web_server?
   Gitlab::Cluster::LifecycleEvents.on_master_start do
     Gitlab::Metrics::Exporter::WebExporter.instance.start
   end

lib/gitlab/gitaly_client.rb

@@ -382,7 +382,7 @@ module Gitlab
     end
 
     def self.long_timeout
-      if Gitlab::Runtime.app_server?
+      if Gitlab::Runtime.web_server?
         default_timeout
       else
         6.hours

lib/gitlab/runtime.rb

@@ -45,7 +45,7 @@ module Gitlab
         !!defined?(::Rails::Console)
       end
 
-      def app_server?
+      def web_server?
         puma? || unicorn?
       end