Show error message to the user in staking flow

[kkosiorowska]

Currently, in our staking flow, we do not show the user any errors when something goes wrong. Let's handle the below fail scenarios:

Tasks

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1. Message signing error (Show error notifications #313)
2. Deposit transaction execution error (Show error notifications #313)
3. Deposit address validation failed or address is invalid (Show error notifications #313)
4. Deposit transaction executed correctly while further steps failed to execute the stake (Handling an error that occurs after a deposit action #325)