chore(runway): cherry-pick fix: cp-8.0.0 musd fiat deposit amount data error prefixes

[runway-github]

• fix: cp-8.0.0 musd fiat deposit amount data error prefixes (fix: cp-8.0.0 musd fiat deposit amount data error prefixes #32314)

Summary

Applies the two-level error prefix pattern to getAmountData in
amount-data-callback.ts:

• Outer (entire getAmountData function): Update Amount Data:
• Inner (around buildMoneyAccountDepositBatch): Money Account Deposit:

A failure during deposit calldata building now surfaces as:

Update Amount Data: Money Account Deposit: <original error>

This matches the naming convention on the core side (MetaMask/core#9250)
and in the useUpdateTransactionPayAmount hook, making it immediately
clear from the error message that the failure occurred in the amount
data callback and specifically in the money account deposit build step.

Also included

• disableUpgrade: true added to useMoneyAccount deposit and
  withdrawal addTransactionBatch calls (the Money Account is always
  already upgraded on Monad)
• error-prefix.ts: reason in CALL_EXCEPTION handling made optional
  to handle ethers errors where reason may be null

---

Note

Low Risk
Targeted error-handling and transaction-batch flags for money account
flows; no auth or broad architectural changes.

Overview
Improves mUSD / money account deposit failures during MM Pay
amount updates by wrapping getAmountData in a two-level
prefixError pattern (Update Amount Data: → Money Account Deposit:), so users and support can tell the failure is in the
amount-data callback and specifically in deposit calldata building.

prefixError now treats ethers CALL_EXCEPTION reason as
optional: when reason is missing or non-string, messages use eth_call failed - <method> instead of falling back to the full verbose ethers
string.

Money account deposit and withdrawal addTransactionBatch calls
set disableUpgrade: true because the money account is already
upgraded on Monad, avoiding unnecessary upgrade logic in the batch
pipeline.

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[6bd3605](https://github.com/MetaMask/metamask-mobile/commit/6bd360594951760791c891ff3107b88c813bddbe)

[github-actions]

🔍 Smart E2E Test Selection

⏭️ Smart E2E selection skipped - PR targets a release or stable branch (release/* or stable)

All E2E tests pre-selected.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud