chore(frontend): Remove making a query to the balance API to check for a 402 error

[amanape]

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• Include this change in the Release Notes. If checked, you must provide an end-user friendly description for your change below

End-user friendly description of the problem this fixes or functionality this introduces.
This was introduced in #7098, I don't remember why, most likely a mistake

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Summarize what the PR does, explaining any non-trivial design decisions.

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docker run -it --rm   -p 3000:3000   -v /var/run/docker.sock:/var/run/docker.sock   --add-host host.docker.internal:host-gateway   -e SANDBOX_RUNTIME_CONTAINER_IMAGE=docker.all-hands.dev/all-hands-ai/runtime:81f013c-nikolaik   --name openhands-app-81f013c   docker.all-hands.dev/all-hands-ai/openhands:81f013c

[rbren]

@amanape can you describe more why we need this?

[amanape]

It's more of a "why we don't need this", it didn't make sense to call the balance query in the home screen, let alone to use it to check for 402s

It adds a source of confusion in our logs since it makes it look like the user was making a balance-related query when they were just in the home screen