changing image source forces re-select all images and architecture individually step by step

[webteam-app]

Bug originally filed by patriciasd at https://bugs.launchpad.net/bugs/1974480

In Our MAAS 3.2.0~beta4 I've got to change the image source to download the Ubuntu 22.10 Kinetic Kudo (development) images, but instead of just adding/selecting that, as usually I did on older MAAS versions, I needed to select each one of the images we already had, one at a time:

22.04 LTS - amd64 - 663.6 MB - Synced
22.04 LTS - arm64 - 757.1 MB - Synced
21.10 - amd64 - 566.5 MB - Synced
21.10 - arm64 - 614.0 MB - Synced
20.04 LTS - amd64 - 1.1 GB - Synced
20.04 LTS - arm64 - 941.8 MB - Synced
18.04 LTS - amd64 - 676.3 MB - Synced
18.04 LTS - arm64 - 550.3 MB - Synced
16.04 LTS - amd64 - 541.0 MB - Synced
16.04 LTS - arm64 - 441.6 MB - Synced

it is because there's a radio/option button for each Ubuntu Release instead of a checkbox (like there're for the architectures)

[anthonydillon]

Group the images issues into an epic to revamp the images section @Caleb-Ellis