Revert "Revert "Test suite: mark "Scenario: Tails shuts down on USB boot...

Revert "Revert "Test suite: mark "Scenario: Tails shuts down on USB boot medium removal" as fragile.""

This reverts commit bfb67b1e.

refs: #11590

features/checks.feature

@@ -89,6 +89,8 @@ Feature: Various checks
     When I eject the boot medium
     Then Tails eventually shuts down
 
+  #10720
+  @fragile
   Scenario: Tails shuts down on USB boot medium removal
     Given I have started Tails without network from a USB drive without a persistent partition and logged in
     When I eject the boot medium