Bug: Same Username for Portal and AGOL

When a user logins to ArcGIS Assistant with the same username for both Portal and ArcGIS Online it prevents the person from having multiple accounts logged in at the same time. This occurs due to createAccountKey using a portal property that is not unique between Enterprise Portals / AGOL orgs.

## Expected Behavior

I am expecting to be logged into both ArcGIS Online and ArcGIS Enterprise regardless of whether the user name is the same between both.

## Current Behavior

In select cases logging into multiple Portals/Orgs with the same username causes the previous account to be overwritten with the current account.

## Possible Solution

## Steps to Reproduce (for bugs)

1. In Account Manager login to two separate enterprise portals with the same username

## Context + Screenshots

## Your Environment

* Version used: 0.62.0
* Browser Name and version: Chrome
* Operating System and version (desktop or mobile): MacOS
* Link to your project: