Fix Across Predict withdraw gas payment edges

[pedronfigueiredo]

Summary

This is PR 4 of 4 in the core stack for Predict withdraws over Across.

• Fixes TransactionController gas-fee-token publishing when native token usage is explicitly excluded.
• Handles Across gas-station edge cases for post-quote Predict withdraws, including source-token gas pricing fallback when the gas station cannot price the token directly.
• Caps prefunded post-quote Predict withdraw gas estimates at the configured Across fallback when batch simulation inflates the estimate.
• Keeps transaction-pay-controller coverage at 100% and exercises the transaction-controller gas-fee-token path.

Stack

1. Add Across Predict withdraw plumbing #8759: plumbing to identify Predict Across withdraws
2. Add Across Predict withdraw quote support #8760: quote support
3. Add Across Predict withdraw submit support #8761: submit support
4. This PR: gas payment edge cases

Validation

• yarn workspace @metamask/transaction-pay-controller run jest --no-coverage src/strategy/across/across-quotes.test.ts src/strategy/across/across-submit.test.ts src/strategy/across/AcrossStrategy.test.ts
• yarn workspace @metamask/transaction-controller run jest --no-coverage src/utils/gas-fee-tokens.test.ts
• yarn changelog:validate
• yarn workspace @metamask/transaction-pay-controller run test
• yarn workspace @metamask/transaction-controller run test

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Note

Medium Risk
Adjusts gas-fee-token selection and Across quote fee calculation logic, which can affect whether transactions proceed and how much gas is reserved/charged. Changes are well-covered by new tests but touch transaction publishing and fee estimation paths.

Overview
Fixes TransactionController pre-publish gas-fee-token handling so excludeNativeTokenForFee forces the external-sign/gas-fee-token path (skipping native-balance checks) and clears nonce when preparing to publish with a selected gas token.

Improves Across post-quote Predict-withdraw fee handling by (1) preferring source gas-fee-token pricing even if native balance is available (with a guard when the account can’t use 7702), (2) adding a fiat-rate-based fallback when the gas station can’t price the source token, and (3) capping inflated prefunded 7702 batch gas estimates to the configured Across fallback and falling back to relaxed per-transaction estimates when batch estimation fails.

Adds extensive unit tests for these edge cases and updates changelogs for both transaction-controller and transaction-pay-controller.

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