loading is not needed with zeitwerk autoloader

This was only needed for classic autoloader.  The core "freedom" patch made zeitwerk autoloader
bypass the interlock anyway, so now that we're only supporting zeitwerk, this is no longer
needed.

Co-dependency:
ManageIQ/manageiq#22801

Part of the rails 7 upgrade: ManageIQ/manageiq#22052

app/controllers/api/providers_controller.rb

@@ -141,15 +141,11 @@ def provider_options(type)
     end
 
     def permitted_subclasses
-      ActiveSupport::Dependencies.interlock.loading do
-        ManageIQ::Providers::BaseManager.permitted_subclasses
-      end
+      ManageIQ::Providers::BaseManager.permitted_subclasses
     end
 
     def supported_types_for_create
-      ActiveSupport::Dependencies.interlock.loading do
-        ExtManagementSystem.supported_types_for_create
-      end
+      ExtManagementSystem.supported_types_for_create
     end
 
     def providers_options

lib/api/environment.rb

@@ -26,12 +26,9 @@ def self.time_attributes
         next if cspec[:klass].blank?
         klass = nil
 
-        # Ensure we're the only thread trying to autoload classes and their columns
-        ActiveSupport::Dependencies.interlock.loading do
-          klass = cspec[:klass].constantize
-          klass.columns_hash.each do |name, typeobj|
-            result << name if %w(date datetime).include?(typeobj.type.to_s)
-          end
+        klass = cspec[:klass].constantize
+        klass.columns_hash.each do |name, typeobj|
+          result << name if %w(date datetime).include?(typeobj.type.to_s)
         end
       end
     end