Deprecate the delegation of Array 'delete_if' method in ActiveRecord::Delegation

This PR is related to: #12213.

This commit https://github.com/rails/rails/commit/1a40be02113287d9a003f8224e91b9f623857f4b didn't add the 'delete_if' to the lists of deprecated methods, so this PR basically add this method to the list of deprecated methods.