[Wallet] Balances are not refreshed automatically

[bonomat]

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The current implementation polls balances state only on reloading the UI or when triggered manually.

https://github.com/comit-network/waves/blob/052878b3ba213132d5099dd9d171736c7d464280/extension/src/App.tsx#L29-L47

Ideally this is refreshed automatically.

If this is done, we can remove some busy waits in the e2e tests.