While cleaning up the CentralNotice admin interface is on people's minds, I think we can safely get rid of the "Automatically create landing page link" feature when editing a banner. This was only ever used by Fundraising, and hasn't been used in several years since banners always link straight to payments wiki now. In the unlikely event we do ever need similar behaviour in future, it's trivial to implement in javascript.
Tech can decide whether to wipe out that code completely, or just hide the option from the interface.
AW: Let's remove it. Confirmed that it's been unused for 2 years.