Allow submitters to see admin-dismissed duplicate violations

[MelvinBot]

Explanation of Change

When an admin resolves duplicate transaction violations via "Keep all", the dismissal is recorded under the admin's email. The employee/submitter's client had no reciprocal check to recognize that dismissal, so the duplicate review UI (RBR + "Review Duplicates" button) persisted on the employee side.

This adds a check in isViolationDismissed so that when the submitter views their own open expense report and anyone (admin/approver) has already dismissed the violation, it returns true — mirroring the existing admin-side logic that checks for submitter dismissals.

Fixed Issues

$ #86715
PROPOSAL: #86715 (comment)

AI Tests

• Ran TransactionUtilsTest.ts — 256 tests passed, 0 failed
• Updated existing test case to expect true when submitter views open report with admin-dismissed violation
• Added new test: submitter viewing processing report with admin dismissal still returns false (correct boundary)
• ESLint: passed with 0 warnings
• TypeScript (typecheck-tsgo): passed
• Prettier: no formatting changes needed

Human Tests

// TODO: The human co-author must fill out the tests you ran before marking this PR as "ready for review"
// Please describe what tests you performed that validates your changed worked.

QA

// TODO: The human co-author must fill out the QA tests you ran before marking this PR as "ready for review".

Suggested QA steps:

1. As Admin, navigate to an employee's workspace chat with duplicate unsubmitted expenses
2. Open the expense report, select "Review duplicates", then click "Keep all"
3. As the Employee, navigate to the same expense report
4. Verify the duplicate review indicator and "Resolve duplicate" button are no longer shown
5. Verify 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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