*: adyen, authorize, demo, razorpay, stripe.
The param `create_refund_transaction` from `_send_refund_request` became
useless following this commit:
https://github.com/odoo/odoo/commit/e4c63126b45854b10f08ab14dee5eb1d4ed98bb0
It was only used for Authorize.net, which now works without calling this
param.
task-2869910
closesodoo/odoo#101105
X-original-commit: 6855d65df7a83037ee5e2202966fa4e67dae7d5a
Signed-off-by: Antoine Vandevenne (anv) <anv@odoo.com>