Remove ActiveStorage's deprecated configs

`config.active_storage.replace_on_assign_to_many` has been removed at b06252e
and `config.active_storage.silence_invalid_content_types_warning` at 0cf8444.

Also in the upgrade guide the versions these configs were deprecated and removed were not accurate
so corrected them accordingly.

activestorage/lib/active_storage/engine.rb

@@ -118,15 +118,6 @@ class Engine < Rails::Engine # :nodoc:
         ActiveStorage.content_types_allowed_inline = app.config.active_storage.content_types_allowed_inline || []
         ActiveStorage.binary_content_type = app.config.active_storage.binary_content_type || "application/octet-stream"
         ActiveStorage.video_preview_arguments = app.config.active_storage.video_preview_arguments || "-y -vframes 1 -f image2"
-
-        unless app.config.active_storage.silence_invalid_content_types_warning.nil?
-          ActiveStorage.silence_invalid_content_types_warning = app.config.active_storage.silence_invalid_content_types_warning
-        end
-
-        unless app.config.active_storage.replace_on_assign_to_many.nil?
-          ActiveStorage.replace_on_assign_to_many = app.config.active_storage.replace_on_assign_to_many
-        end
-
         ActiveStorage.track_variants = app.config.active_storage.track_variants || false
       end
     end

guides/source/upgrading_ruby_on_rails.md

@@ -1326,7 +1326,7 @@ user.highlights.first.filename # => "funky.jpg"
 user.highlights.second.filename # => "town.jpg"
 ```
 
-Existing applications can opt in to this new behavior by setting [`config.active_storage.replace_on_assign_to_many`][] to `true`. The old behavior will be deprecated in Rails 7.0 and removed in Rails 7.1.
+Existing applications can opt in to this new behavior by setting [`config.active_storage.replace_on_assign_to_many`][] to `true`. The old behavior was deprecated in Rails 7.1 and removed in Rails 7.2.
 
 [`config.active_storage.replace_on_assign_to_many`]: configuring.html#config-active-storage-replace-on-assign-to-many