Iss #75 - Update lookup to allow for user or email, switch to fetch

• Iss #75 - Update lookup to allow for user or email, switch to fetch

When looking up by username, there is no login requirement. For lookup by email, the initial req. of being logged in as a committer is still present. Additionally, switched from jq ajax to native fetch API to modernize call.

As part of this upgrade, ECA API was switched from custom user objects to using the SDK EF services profile service to lookup user accounts. This gave the ability to search by different user attributes more easily.