`MoneyRequestConfirmationList` re-renders on unrelated report and policy field changes

[marcaaron]

Problem

When creating an expense, if any field on the report or policy object changes (e.g. lastMessageText, hasDraft, name), MoneyRequestConfirmationList re-renders even though it only uses report.type and policy.customUnits. This causes up to 5 re-renders per scenario when only 1 is needed.

Solution

Add Onyx selectors to the transactionReport and policyDraft subscriptions so the component only receives the fields it actually uses (report.type, policy.customUnits). Updates to unrelated fields no longer trigger re-renders, reducing unnecessary renders by ~80%.

Issue Owner

Current Issue Owner: @ShridharGoel