Upgrade Rails to 7.0.5

What does this MR do and why?

This MR:

• Upgrades the Rails gem version to 7.0.5
• Removes patches that were merged upstream

config/initializers/activerecord_postgresql_timestamp_with_timezone_patches.rb

-# frozen_string_literal: true
-
-# Monkey patch to fix errors like `undefined method 'getutc' for Date' seen
-# during Rails 7 upgrade:
-#
-# See https://gitlab.com/gitlab-org/gitlab/-/merge_requests/90907#note_1253684870 and
-# https://github.com/rails/rails/issues/46341#issuecomment-1406391573
-
-if Rails.gem_version >= Gem::Version.new('7.0.5')
-  raise "Remove `#{__FILE__}`. This is backport of https://github.com/rails/rails/pull/46365"
-end
-
-module ActiveRecord
-  module ConnectionAdapters
-    module PostgreSQL
-      module OID # :nodoc:
-        class TimestampWithTimeZone < DateTime # :nodoc:
-          def type
-            real_type_unless_aliased(:timestamptz)
-          end
-
-          def cast_value(value)
-            return if value.blank?
-
-            time = super
-            return time unless time.acts_like?(:time)
-
-            # While in UTC mode, the PG gem may not return times back in "UTC" even if they were provided to
-            # Postgres in UTC. We prefer times always in UTC, so here we convert back.
-            if is_utc?
-              time.getutc
-            else
-              time.getlocal
-            end
-          end
-        end
-      end
-    end
-  end
-end