[IMP] *: remove legacy rpc

This commit removes the files ajax.js and rpc.js then adapts all the
places where their exports were used. For most of the changes, it's a
replace of `this._rpc({...})` by a new `useService("rpc|orm")` like
pattern in the widgets.

closes odoo/odoo#136271

Task: 3439226
Related: odoo/enterprise#47775
Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>

addons/payment_authorize/static/src/js/payment_form.js

@@ -138,14 +138,11 @@ paymentForm.include({
         }
 
         // Initiate the payment
-        this._rpc({
-            route: '/payment/authorize/payment',
-            params: {
-                'reference': processingValues.reference,
-                'partner_id': processingValues.partner_id,
-                'opaque_data': response.opaqueData,
-                'access_token': processingValues.access_token,
-            }
+        this.rpc('/payment/authorize/payment', {
+            'reference': processingValues.reference,
+            'partner_id': processingValues.partner_id,
+            'opaque_data': response.opaqueData,
+            'access_token': processingValues.access_token,
         }).then(() => {
             window.location = '/payment/status';
         }).guardedCatch((error) => {