[Release-1.28] - Windows air-gap images.txt listing missing images

[brandond]

Backport fix for Windows air-gap images.txt listing missing images

• Windows air-gap images.txt listing missing images #6579

[mdrahman-suse]

Validated with RC v1.28.13-rc2+rke2r1

File: https://github.com/rancher/rke2/releases/download/v1.28.13-rc2%2Brke2r1/rke2-images.windows-amd64.txt
Contents:

$ sudo cat rke2-images.windows-amd64.txt
docker.io/rancher/mirrored-pause:3.6
docker.io/rancher/rke2-runtime:v1.28.13-rc2-rke2r1-windows-amd64

DH image: https://hub.docker.com/r/rancher/mirrored-pause/tags?page=&page_size=&ordering=&name=3.6

Successfully created airgap cluster with Windows agent via private registry

$ rke2 -v
rke2 version v1.28.13-rc2+rke2r1 (466525b7cc654d59c101ddb27fec409a10940a5b)
go version go1.22.5 X:boringcrypto

$ kgn
NAME              STATUS   ROLES                       AGE     VERSION
ip-xxx-xx-0-217   Ready    control-plane,etcd,master   12m     v1.28.13+rke2r1
ip-xxx-xx-6-17    Ready    <none>                      14m     v1.28.13+rke2r1
ip-ac1f67db       Ready    <none>                      120s    v1.28.13