chore(ui-ux): remove eth wallet balance poll

[pierregee]

What this PR does / why we need it:

The balance will be refetched on the following events (ethereum network dropdown)

• token changed
• 15 seconds after confirming a txn
• Press review txn (to make sure we are validating against the most updated balance)

Which issue(s) does this PR fixes?:

Fixes #702

Additional comments?:

Developer Checklist:

• Read your code changes at least once
• No console errors on web
• Tested on Light mode and Dark mode*
• Your UI implementation visually matched the rendered design*
• Unit tests*
• Added e2e tests*
• Added translations*

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