feat: yield.xyz earn tab

[gomesalexandre]

Description

• Adds new earn tab in swapper under flag for more one-click yield aping
• Performs more code extraction / unification
• Honor various enter terminologies depending on yield type
• Smol groundwork for multi-account by virtue of earn tab supporting multi-account

Issue (if applicable)

N/A

Risk

Low - all changes are behind a feature flag (YieldEarnTab)

What protocols, transaction types, wallets or contract interactions might be affected by this PR?

yield.xyz integrations

Testing

Engineering

• Test earn tab with USDT and another asset and ensure it's happy
• Do a sanity check with the two modals (enter CTA/enter/exit modal in yield page) and confirm still happy

Operations

• 🏁 My feature is behind a flag and doesn't require operations testing (yet)

Screenshots (if applicable)

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat_yield_polish_3

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