Migrate some `ImageChooserBlock` instances to `ImageBlock`#480

Draft

Stormheg wants to merge 3 commits intomainfrom chore/migrate-imagechoosers-to-imageblock

+1,998-9

Commits on Dec 4, 2024

Migrate some ImageChooserBlock instances to ImageBlock

Stormheg
authored and
cnk
committed
Patch to use image's default_alt_text when converting existing images to ImageBlock
cnk
committed
Migration files for the first set of ImageChoiceBlock to ImageBlock changes
cnk
committed