[ENG-358] Malicious client protection for the KM (#562)

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* add `queue_check`, `mount_check` and `unlock_check`

* make `unlock_check` marginally more readable

* clippy

* clean up & rename functions

* remove unlock check on `keys.list`

* use american spelling of `favorite`

* use `then_some` (thanks clippy)

* more american spelling

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