[proposal] Drop Support for Koala (2024.1)

[pq]

As per our conversation offline, I propose we stop supporting 2024.1. This will allow us to move off (at least) the slated-for-removal addBrowseFolderListener API variations we are currently unsafely depending on.

See: #8070 and #8071

@anderdobo @jwren

[jwren]

LGTM, include Ladybug as well given our conversation. This will help with with #7718.

[anderdobo]

LGTM.