Remove Status/ivar/shapes regression check from test env (#30580)

config/environments/test.rb

@@ -61,12 +61,6 @@ Rails.application.configure do
   config.i18n.default_locale = :en
   config.i18n.fallbacks = true
 
-  config.to_prepare do
-    # Force Status to always be SHAPE_TOO_COMPLEX
-    # Ref: https://github.com/mastodon/mastodon/issues/23644
-    10.times { |i| Status.allocate.instance_variable_set(:"@ivar_#{i}", nil) }
-  end
-
   # Tell Active Support which deprecation messages to disallow.
   config.active_support.disallowed_deprecation_warnings = []