[No QA]: refactor: move participant setters from IOU/index.ts to MoneyRequest.ts

[DylanDylann]

Details

Part of #72804 — break up the oversized src/libs/actions/IOU/index.ts.

Follow-up to #90157 (init/start move). This PR moves 6 participant-related functions
from src/libs/actions/IOU/index.ts to src/libs/actions/IOU/MoneyRequest.ts:

• setMoneyRequestParticipants
• getMoneyRequestParticipantsFromReport
• setMoneyRequestParticipantsFromReport
• setMultipleMoneyRequestParticipantsFromReport
• getIOURequestPolicyID
• updateLastLocationPermissionPrompt

MoneyRequest.ts was already importing 5 of the 6 functions from index.ts — moving
them in completes the co-location.

Byte-identical move except for namespace→named import renames:

• OnyxTypes.Report → Report
• OnyxTypes.Transaction → Transaction

No re-exports in index.ts — external callers updated directly to import from
@userActions/IOU/MoneyRequest. DAG stays clean.

This is PR G2a of the index.ts cleanup series:

• PR G1 ([No QA]: refactor: move init/start functions from IOU/index.ts to MoneyRequest.ts #90157, merged): init/start
• PR G2a (this one): participant setters (6 functions, 30 files)
• PR G2b (future): other field setters (~18 functions)
• PR G2c (future): distance/custom-unit setters (~6 functions)
• PR G2d (future): tax setters (~4 functions)
• PR G3 (future): requestMoney from TrackExpense.ts

Fixed Issues

$ #72804
PROPOSAL: N/A — code-organization refactor.

Tests

• Verify that no errors appear in the JS console

Offline tests

N/A — purely a code-organization refactor; runtime behavior is identical.

QA Steps

• Verify that no errors appear in the JS console

PR Author Checklist

• I linked the correct issue in the ### Fixed Issues section above
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Screenshots/Videos

N/A — refactor only, no UI changes.

[melvin-bot]

@parasharrajat Please copy/paste the Reviewer Checklist from here into a new comment on this PR and complete it. If you have the K2 extension, you can simply click: [this button]

[codecov]

Codecov Report

❌ Looks like you've decreased code coverage for some files. Please write tests to increase, or at least maintain, the existing level of code coverage. See our documentation here for how to interpret this table.

Files with missing lines	Coverage Δ
...ponents/TestDrive/Modal/EmployeeTestDriveModal.tsx	0.00% <ø> (ø)
src/hooks/useDeleteTransactions.ts	23.59% <ø> (ø)
src/hooks/useParticipantSubmission.ts	0.00% <ø> (ø)
src/hooks/useReceiptScanDrop.tsx	46.34% <ø> (ø)
src/libs/ReportUtils.ts	83.53% <ø> (ø)
src/libs/actions/IOU/Duplicate.ts	91.58% <ø> (ø)
src/libs/actions/IOU/SplitTransactionUpdate.ts	90.27% <ø> (ø)
src/libs/actions/IOU/index.ts	83.50% <ø> (-1.08%)	⬇️
src/pages/Share/SubmitDetailsPage.tsx	0.00% <ø> (ø)
...inbox/report/ReportActionCompose/useReceiptDrop.ts	44.73% <ø> (ø)
... and 20 more
... and 13 files with indirect coverage changes

[joekaufmanexpensify]

No product review needed