Drop default permissions policy initializer (rails#52341)

It is too rarely used to warrant such a prominent placement in the
default structure.

Author: dhh

actionmailbox/test/dummy/config/initializers/permissions_policy.rb

@@ -145,7 +145,6 @@ def config_when_updating
       asset_manifest_exist            = File.exist?("app/assets/config/manifest.js")
       asset_app_stylesheet_exist      = File.exist?("app/assets/stylesheets/application.css")
       csp_config_exist                = File.exist?("config/initializers/content_security_policy.rb")
-      permissions_policy_config_exist = File.exist?("config/initializers/permissions_policy.rb")
 
       @config_target_version = Rails.application.config.loaded_config_version || "5.0"
 
@@ -179,10 +178,6 @@ def config_when_updating
         unless csp_config_exist
           remove_file "config/initializers/content_security_policy.rb"
         end
-
-        unless permissions_policy_config_exist
-          remove_file "config/initializers/permissions_policy.rb"
-        end
       end
     end
 
@@ -559,7 +554,6 @@ def delete_action_cable_files_skipping_action_cable
       def delete_non_api_initializers_if_api_option
         if options[:api]
           remove_file "config/initializers/content_security_policy.rb"
-          remove_file "config/initializers/permissions_policy.rb"
         end
       end
 

actiontext/test/dummy/config/initializers/permissions_policy.rb

@@ -115,7 +115,6 @@ def test_app_update_does_not_generate_unnecessary_config_files
 
     assert_no_file "config/initializers/assets.rb"
     assert_no_file "config/initializers/content_security_policy.rb"
-    assert_no_file "config/initializers/permissions_policy.rb"
   end
 
   def test_app_update_does_not_generate_unnecessary_bin_files
@@ -187,7 +186,6 @@ def skipped_files
          bin/yarn
          config/initializers/assets.rb
          config/initializers/content_security_policy.rb
-         config/initializers/permissions_policy.rb
          lib/assets
          test/helpers
          public/404.html

activestorage/test/dummy/config/initializers/permissions_policy.rb

@@ -53,7 +53,6 @@
   config/initializers/content_security_policy.rb
   config/initializers/filter_parameter_logging.rb
   config/initializers/inflections.rb
-  config/initializers/permissions_policy.rb
   config/locales/en.yml
   config/master.key
   config/puma.rb

railties/lib/rails/generators/rails/app/app_generator.rb

@@ -56,7 +56,6 @@
   test/dummy/config/initializers/content_security_policy.rb
   test/dummy/config/initializers/filter_parameter_logging.rb
   test/dummy/config/initializers/inflections.rb
-  test/dummy/config/initializers/permissions_policy.rb
   test/dummy/config/locales/en.yml
   test/dummy/config/puma.rb
   test/dummy/config/routes.rb