[IMP] mail: add a new payment-specific notification template

This commit introduces a new notification template. Its target is to be used
when sending payment-based templates like 'Send by email' for sale orders,
invoices or purchase orders.

Purpose is to separate the template content (payment information) from the
payment button (Pay and sign online) when sending those documents by
email. Composer and chatter should not hold the button. It should be added
only in notifications emails.

Technical solution is to have a somewhat-generic template available in mail
to be used in some specific actions. Another solution is to hide the
button but it breaks if people edit or remove the hidden content when
editing the mail in the composer without knowing it. As the button is
mandatory in those actions we choose to have it added by the notification
email.

Future commits will gradually use this template in some addons.

This commit is linked to task ID 1860049 and PR #25824.

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