Remove AuditEventArchived model

This removes the unused model

.rubocop_manual_todo.yml

@@ -2278,7 +2278,6 @@ Gitlab/NamespacedClass:
     - 'app/models/application_setting/term.rb'
     - 'app/models/approval.rb'
     - 'app/models/audit_event.rb'
-    - 'app/models/audit_event_archived.rb'
     - 'app/models/authentication_event.rb'
     - 'app/models/award_emoji.rb'
     - 'app/models/badge.rb'

app/models/audit_event_archived.rb

-# frozen_string_literal: true
-
-# This model is not intended to be used.
-# It is a temporary reference to the pre-partitioned
-# audit_events table.
-# Please refer to https://gitlab.com/groups/gitlab-org/-/epics/3206
-# for details.
-class AuditEventArchived < ApplicationRecord
-  self.table_name = 'audit_events_archived'
-end

spec/models/audit_event_archived_spec.rb

-# frozen_string_literal: true
-
-require 'spec_helper'
-
-RSpec.describe AuditEventArchived do
-  let(:source_table) { AuditEvent }
-  let(:destination_table) { described_class }
-
-  it 'has the same columns as the source table' do
-    column_names_from_source_table = column_names(source_table)
-    column_names_from_destination_table = column_names(destination_table)
-
-    expect(column_names_from_destination_table).to match_array(column_names_from_source_table)
-  end
-
-  it 'has the same null constraints as the source table' do
-    constraints_from_source_table = null_constraints(source_table)
-    constraints_from_destination_table = null_constraints(destination_table)
-
-    expect(constraints_from_destination_table.to_a).to match_array(constraints_from_source_table.to_a)
-  end
-
-  it 'inserts the same record as the one in the source table', :aggregate_failures do
-    expect { create(:audit_event) }.to change { destination_table.count }.by(1)
-
-    event_from_source_table = source_table.connection.select_one(
-      "SELECT * FROM #{source_table.table_name} ORDER BY created_at desc LIMIT 1"
-    )
-    event_from_destination_table = destination_table.connection.select_one(
-      "SELECT * FROM #{destination_table.table_name} ORDER BY created_at desc LIMIT 1"
-    )
-
-    expect(event_from_destination_table).to eq(event_from_source_table)
-  end
-
-  def column_names(table)
-    table.connection.select_all(<<~SQL)
-      SELECT c.column_name
-      FROM information_schema.columns c
-      WHERE c.table_name = '#{table.table_name}'
-    SQL
-  end
-
-  def null_constraints(table)
-    table.connection.select_all(<<~SQL)
-      SELECT c.column_name, c.is_nullable
-      FROM information_schema.columns c
-      WHERE c.table_name = '#{table.table_name}'
-      AND c.column_name != 'created_at'
-    SQL
-  end
-end