Create a function within the `client/src/api/UserApiService.js` component that updates the user's email address

[trillium]

Overview

We need a function similar to the updateUserDbIsActive function within client/src/api/UserApiService.js to update the user's email.

Action items

• Create a new function updateUserEmail within client/src/api/UserApiService.js that patches the user's email in the database