Fix unreported expenses not moved into expense report

[MelvinBot]

Explanation of Change

PR #81742 refactored AddUnreportedExpenseFooter to use an Onyx selector instead of loading the entire transaction collection. The selector stored selected transactions with bare transactionID keys (e.g., 'abc123'), but changeTransactionsReport expects Onyx collection-prefixed keys (e.g., 'transactions_abc123'). This caused all transaction lookups to return undefined, silently preventing unreported expenses from being moved into expense reports.

This fix adds the ONYXKEYS.COLLECTION.TRANSACTION prefix to the keys in the selector output, matching the format expected by changeTransactionsReport. The convertBulkTrackedExpensesToIOU path (IOU reports) is unaffected since it uses Object.values() which ignores keys.

Fixed Issues

$ #83761

Tests

1. Create a new account
2. Submit 2 tracked expenses to self DM
3. Create a workspace
4. Open workspace chat
5. Create an empty expense report
6. Click "Add unreported expenses"
7. Select both unreported expenses
8. Confirm
9. Verify that the two tracked expenses are moved into the expense report

• Verify that no errors appear in the JS console

Offline tests

N/A - This is a data key format fix in the transaction selector. Offline behavior is not affected.

QA Steps

1. Create a new account
2. Submit 2 tracked expenses to self DM
3. Create a workspace
4. Open workspace chat
5. Create an empty expense report
6. Click "Add unreported expenses"
7. Select both unreported expenses
8. Confirm
9. Verify that the two tracked expenses are successfully moved into the expense report

• Verify that no errors appear in the JS console

PR Author Checklist

• I linked the correct issue in the ### Fixed Issues section above
• I wrote clear testing steps that cover the changes made in this PR
  • I added steps for local testing in the Tests section
  • I added steps for the expected offline behavior in the Offline steps section
  • I added steps for Staging and/or Production testing in the QA steps section
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• I included screenshots or videos for tests on all platforms
• I ran the tests on all platforms & verified they passed on:
  • Android: Native
  • Android: mWeb Chrome
  • iOS: Native
  • iOS: mWeb Safari
  • MacOS: Chrome / Safari
• I verified there are no console errors (if there's a console error not related to the PR, report it or open an issue for it to be fixed)
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Screenshots/Videos

Android: Native

N/A - One-line logic fix with no UI changes

Android: mWeb Chrome

N/A - One-line logic fix with no UI changes

iOS: Native

N/A - One-line logic fix with no UI changes

iOS: mWeb Safari

N/A - One-line logic fix with no UI changes

MacOS: Chrome / Safari

N/A - One-line logic fix with no UI changes