DEV: Revert rails 7.1 upgrade (#27522)

* Revert "FIX: Set `override_level` on Logster loggers (#27519)"

This reverts commit c1b0488c547bca935de51cfbb86bbc528e9ab2e5.

* Revert "DEV: Make parameters optional to all FakeLogger methods"

This reverts commit 3318dad7b4e3365854319bb55301cf667a2c28d0.

* Revert "FIX: Remove references to `Rails.logger.chained`"

This reverts commit f595d599dd361b7fb39fb3c82cbc11d19d518c19.

* Revert "DEV: Upgrade Rails to 7.1"

This reverts commit 081b00391e47a7f9bc44b9fe8ce88ac97d728352.

lib/discourse.rb

@@ -954,7 +954,14 @@ module Discourse
   def self.warn(message, env = nil)
     append = env ? (+" ") << env.map { |k, v| "#{k}: #{v}" }.join(" ") : ""
 
-    loggers = Rails.logger.broadcasts
+    if !(Logster::Logger === Rails.logger)
+      Rails.logger.warn("#{message}#{append}")
+      return
+    end
+
+    loggers = [Rails.logger]
+    loggers.concat(Rails.logger.chained) if Rails.logger.chained
+
     logster_env = env
 
     if old_env = Thread.current[Logster::Logger::LOGSTER_ENV]
@@ -1109,7 +1116,16 @@ module Discourse
       end
     end
 
+    schema_cache = ActiveRecord::Base.connection.schema_cache
+
     RailsMultisite::ConnectionManagement.safe_each_connection do
+      # load up schema cache for all multisite assuming all dbs have
+      # an identical schema
+      dup_cache = schema_cache.dup
+      # this line is not really needed, but just in case the
+      # underlying implementation changes lets give it a shot
+      dup_cache.connection = nil
+      ActiveRecord::Base.connection.schema_cache = dup_cache
       I18n.t(:posts)
 
       # this will force Cppjieba to preload if any site has it