``contract_payment_mode`` v18 still depends on ``account_payment_partner``
(removed by the bank-payment renaming) and uses the obsolete
``account.payment.mode`` model; no v18 replacement provides contract
integration, and only 2 contracts carried a ``payment_mode_id``.
Must run BEFORE the bank-payment renaming and BEFORE OpenUpgrade's
``button_upgrade()`` which would otherwise crash on the missing
dependency.
The module is DELETED (module row + ``ir_model_data`` + dependencies)
rather than marked 'to remove', because Odoo's "Transient module states
were reset" in ``load_modules()`` converts 'to remove' -> 'installed',
making ``button_upgrade()`` re-parse the missing
``account_payment_partner`` dependency and abort the registry load. The
orphaned ``base.module_contract_payment_mode`` xmlid is renamed so
``update_list()`` rediscovers the physical addon as a fresh uninstalled
module that ``button_upgrade()`` never touches.
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