Remove deprecation for aggregations that are grouping in duplicated fields

Now we will apply the behavior that is intended to Rails 7, which ignores
the duplicated fields.

Author: rafaelfranca

activerecord/lib/active_record/relation/calculations.rb

@@ -329,15 +329,6 @@ def execute_grouped_calculation(operation, column_name, distinct) # :nodoc:
         group_fields = group_values
         group_fields = group_fields.uniq if group_fields.size > 1
 
-        unless group_fields == group_values
-          ActiveSupport::Deprecation.warn(<<-MSG.squish)
-            `#{operation}` with group by duplicated fields does no longer affect to result in Rails 7.0.
-            To migrate to Rails 7.0's behavior, use `uniq!(:group)` to deduplicate group fields
-            (`#{klass.name&.tableize || klass.table_name}.uniq!(:group).#{operation}(#{column_name.inspect})`).
-          MSG
-          group_fields = group_values
-        end
-
         if group_fields.size == 1 && group_fields.first.respond_to?(:to_sym)
           association  = klass._reflect_on_association(group_fields.first)
           associated   = association && association.belongs_to? # only count belongs_to associations

activerecord/test/cases/calculations_test.rb

@@ -159,36 +159,24 @@ def test_group_by_multiple_same_field
     assert_equal expected, accounts.merge!(accounts).uniq!(:group).sum(:credit_limit)
 
     expected = {
-      [nil, nil] => 50,
-      [1, 1] => 50,
-      [2, 2] => 60,
-      [6, 6] => 55,
-      [9, 9] => 53
+      nil => 50,
+      1 => 50,
+      2 => 60,
+      6 => 55,
+      9 => 53
     }
-    message = <<-MSG.squish
-      `maximum` with group by duplicated fields does no longer affect to result in Rails 7.0.
-      To migrate to Rails 7.0's behavior, use `uniq!(:group)` to deduplicate group fields
-      (`accounts.uniq!(:group).maximum(:credit_limit)`).
-    MSG
-    assert_deprecated(message) do
-      assert_equal expected, accounts.merge!(accounts).maximum(:credit_limit)
-    end
+
+    assert_equal expected, accounts.merge!(accounts).maximum(:credit_limit)
 
     expected = {
-      [nil, nil, nil, nil] => 50,
-      [1, 1, 1, 1] => 50,
-      [2, 2, 2, 2] => 60,
-      [6, 6, 6, 6] => 50,
-      [9, 9, 9, 9] => 53
+      nil => 50,
+      1 => 50,
+      2 => 60,
+      6 => 50,
+      9 => 53
     }
-    message = <<-MSG.squish
-      `minimum` with group by duplicated fields does no longer affect to result in Rails 7.0.
-      To migrate to Rails 7.0's behavior, use `uniq!(:group)` to deduplicate group fields
-      (`accounts.uniq!(:group).minimum(:credit_limit)`).
-    MSG
-    assert_deprecated(message) do
-      assert_equal expected, accounts.merge!(accounts).minimum(:credit_limit)
-    end
+
+    assert_equal expected, accounts.merge!(accounts).minimum(:credit_limit)
   end
 
   def test_should_generate_valid_sql_with_joins_and_group