[Due for payment 2026-05-12][IOURequestStepScan Decomposition] perf: selectors on derived hooks + export IOU getters

[cristipaval]

Part of IOURequestStepScan Decomposition Plan — see rinej's split design comment.

Parent: #85583

Problem

Monolithic IOURequestStepScan pulls in coarse subscriptions via shared hooks; until those hooks use narrow selectors, unrelated Onyx updates can still force broad re-renders.

Solution

Add selectors to useReportIsArchived, useDefaultExpensePolicy, usePolicyForMovingExpenses, and useReportAttributes (including exporting useReportAttributesByID where needed), and export getAllTransactionDrafts() and getAllReportNameValuePairs() from src/libs/actions/IOU/index.ts so variants can reuse stable getters.

Issue Owner

Current Issue Owner: @mallenexpensify

[cristipaval]

The PR hit prod

[cristipaval]

Reopening to pay @bernhardoj. Payment is already due, @mallenexpensify 🙏

[melvin-bot]

Triggered auto assignment to @mallenexpensify (Awaiting Payment)