create persistent storage from the greeter

boyskarequested to merge
15586-instruct-create-persistent-storage into testing
  • basic functionality
  • automated testing
  • fix image (see 03_15_18_Persistent_Greeter_options)
  • test case Persistent Greeter options is broken by the huge window
  • reimplement new UI
  • UX decisions:
    • real estate
    • should the button be a suggested-action (ie: a blue one?)

Closes #15586 (closed)

Edited by boyska

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