Add cache headers to static files served through Rails (#24120)

config/environments/test.rb

@@ -12,11 +12,6 @@ Rails.application.configure do
   # preloads Rails for running tests, you may have to set it to true.
   config.eager_load = false
 
-  # Configure public file server for tests with Cache-Control for performance.
-  config.public_file_server.enabled = true
-  config.public_file_server.headers = {
-    'Cache-Control' => "public, max-age=#{1.hour.to_i}"
-  }
   config.assets.digest = false
 
   # Show full error reports and disable caching.