Remove implicit enumerating of columns

- We now have explicit enumeration at the points needed
  instead via https://gitlab.com/gitlab-org/gitlab/-/merge_requests/66337

app/models/members/group_member.rb

@@ -28,8 +28,6 @@ class GroupMember < Member
 
   attr_accessor :last_owner, :last_blocked_owner
 
-  self.enumerate_columns_in_select_statements = true
-
   def self.access_level_roles
     Gitlab::Access.options_with_owner
   end

config/initializers/active_record_build_select.rb

@@ -9,10 +9,6 @@
 # statement cache. If a different migration is then run and one of these columns is
 # removed in the meantime, the query is invalid.
 
-ActiveRecord::Base.class_eval do
-  class_attribute :enumerate_columns_in_select_statements
-end
-
 module ActiveRecord
   module QueryMethods
     private
@@ -20,8 +16,6 @@ module ActiveRecord
     def build_select(arel)
       if select_values.any?
         arel.project(*arel_columns(select_values.uniq))
-      elsif klass.enumerate_columns_in_select_statements
-        arel.project(*klass.column_names.map { |field| table[field] })
       else
         arel.project(@klass.arel_table[Arel.star])
       end

ee/lib/ee/gitlab/background_migration/remove_inaccessible_epic_todos.rb

@@ -19,7 +19,6 @@ module EE
           include FromUnion
 
           self.inheritance_column = :_type_disabled
-          self.enumerate_columns_in_select_statements = true
 
           # backported from ApplicationRecord
           def self.cached_column_list