Cleanup user session on app start

[Kharchevskyi]

This PR Fix issue in case user hasn't finish setup and kill the app

close #351

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Tests:

• Difficult to test. This part requires to have all other parts to be covered with tests
• Manual test

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To be filled by reviewers

I have reviewed that this PR... (tick whichever items you personally focused on during this review):

• addresses the issue it closes (if any)
• code is readable and understandable
• is accompanied with tests, or tests are not needed
• is free of vulnerabilities
• is documented clearly and usefully, or doesn't need documentation

[tomholub]

Code looks good, will re-test

[Kharchevskyi]

is it possible to prioritise #323 before merging this PR?

[tomholub]

Yes - definitely

[tomholub]

Please ping me once it has been brought up to date / conflicts resolved. Thanks!

[Kharchevskyi]

Merged master. I haven't test all flows if it works with "new setup flow", but I assume it will.
(Going to check it probably tomorrow, or you can check and merge if everything works as expected)

[tomholub]

code ok still, will check functionality now

[tomholub]

Should rename isAnyKey to doesAnyKeyExist - filing another issue

[tomholub]

works well