Rename tab fragments

and remove redundant NonNull annotations
3 jobs for !1459 with 2020-offline-sharing-ui in 9 minutes and 56 seconds (queued for 2 seconds)
latest detached
Status Job ID Name Coverage
  Test
passed #9735
test

00:09:56

 
  Optional Tests
manual #9736
kvm allowed to fail manual
android test
manual #9737
allowed to fail manual
bridge test