Create payment activity when creating a payment via the api, test

[eileenmcnaughton]

Overview

Makes api behaviour match the form layer - ie. creating an activity when a payment is made should be path-independent

Before

No activity created when paying via api

After

Activity created & it's tested

Technical Details

This is a pre-requisite for switching AdditionalPayment form to the api

https://github.com/civicrm/civicrm-core/pull/14408/files

Comments

[civibot]

(Standard links)

• If this is your first pull-request for CiviCRM, please browse CONTRIBUTING.md for information about the development and testing processes.
• If you are reviewing this pull-request, you may wish to consult the test sites and the Review Standards (long template, short template).

[eileenmcnaughton]

test this please

[eileenmcnaughton]

@monishdeb this just takes payment activity creation a little further - with test cover

[eileenmcnaughton]

@monishdeb wanna merge this - I think it's kinda straight forward & we are super close to switching over on the AdditionalPayment form now!