Revert "Logging tweaks"

Debug logging interferes with the structured logging, so let's take that
back out.

config/environments/production.rb

@@ -52,17 +52,12 @@ Rails.application.configure do
                                        .tap  { |logger| logger.formatter = ::Logger::Formatter.new }
                                        .then { |logger| ActiveSupport::TaggedLogging.new(logger) }
 
-  # Enable detailed logging
-  config.log_level = :debug
-
-  # Prevent health checks from clogging up the logs.
-  config.silence_healthcheck_path = "/up"
+  # Suppress unstructured log lines
+  config.log_level = :fatal
 
   # Structured JSON logging
   config.structured_logging.logger = ActiveSupport::Logger.new(STDOUT)
 
-  config.solid_queue.logger = ActiveSupport::Logger.new(STDOUT, level: :info)
-
   # Prepend all log lines with the following tags.
   config.log_tags = [ :request_id ]