Silence DebugExceptions template render logs during exceptions

When an exception is raised, those Action View rendering logs are just
noise for the end developer. I recently silenced those from Web Console,
as we do use Action View rendering in it as well. It used created a half
a screen of rendering logs. I think we can save those in this recent
push for cleaner development logs.

Now, the silencing is a bit hacky and we have a bunch of it now, so we
can also invest in turning off the logs directly from Action View
objects instead of silencing off the logging stream.

actionpack/lib/action_dispatch/middleware/debug_exceptions.rb

@@ -36,6 +36,14 @@ def debug_headers(headers)
       def debug_hash(object)
         object.to_hash.sort_by { |k, _| k.to_s }.map { |k, v| "#{k}: #{v.inspect rescue $!.message}" }.join("\n")
       end
+
+      def render(*)
+        if logger = ActionView::Base.logger
+          logger.silence { super }
+        else
+          super
+        end
+      end
     end
 
     def initialize(app, routes_app = nil, response_format = :default)