[Typescript Conversion: Level 20]: Convert ui/helpers/constants/transactions.js to typescript

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## **Description**

Convert `ui/helpers/constants/transactions.js` from JavaScript to TypeScript as part of the TS migration initiative.

## **Scenario (for user stories only)**

_(Not applicable)_

## **Design (for user stories only)**

_(Not applicable)_

## **Technical Details (for technical tasks only)**

- Convert this file to TypeScript.
- Migration Level: **20**
- Dependencies:
- None
- Dependents:
- ui/components/app/transaction-list/transaction-list.component.js
- ui/hooks/useTransactionDisplayData.js
- ui/pages/swaps/fee-card/fee-card.test.js
- ui/selectors/transactions.js

## **[Threat Modeling Framework](https://github.com/adamshostack/4QuestionFrame) (for technical tasks only)**

- What are we working on? Convert file to TypeScript.
- What can go wrong? Type errors, integration mismatches, missing types.
- What are we going to do about it? Write types carefully and test thoroughly.
- Did we do a good job? _(To be evaluated)_

## **Acceptance Criteria**

- File is fully converted to TypeScript.
- Tests pass.
- File adheres to linting rules.
- Functionality remains unchanged.

## **Stakeholder Review (for MetaMask employees only)**

- [X] Engineering
- [ ] Design
- [ ] Product
- [ ] QA
- [ ] Security
- [ ] Legal
- [ ] Marketing
- [ ] Management
- [ ] Other

## **References**

- Parent issue: #31460

Start with ui/helpers/constants/transactions.js and inspect its listed dependents, especially ui/selectors/transactions.js and the transaction-list and display-data modules. Run ui/pages/swaps/fee-card/fee-card.test.js and the relevant lint and test commands; done means the file is fully converted to TypeScript, behavior is unchanged, and tests and lint pass.

Written by the indexing model from the issue text.