[4.x] Support displaying json in transactions note field

[samhibberd]

Description

We use the transactions model note property to store a json string, been super helpful providing extra detail to our app where we need to extend the refund logic.

Issue is the cp tooltip can't parse that json note, this pr adds a little tweak to handle this and means our cp users can see the info they need:

[samhibberd]

Is this something that might get considered for merge?