examples: Port enroll and verify examples to new storage

This ports the enroll and verify examples to the new storage so that
they do not need any deprecated API anymore.
2 jobs for benzea/add-storage-example in 5 minutes and 16 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #357559
build

00:02:07

 
  Test
passed #357560
flatpak master

00:03:09