Pr05/migrate user controller oct proposal 2

[clairep94]

Proposing some logic changes to enable user to change both email and username at the same time, given this is what the current UI seems to allow

Changes:

I have verified that this pull request:

• has no linting errors (npm run lint)
• has no test errors (npm run test)
• is from a uniquely-named feature branch and is up to date with the develop branch.
• is descriptively named and links to an issue number, i.e. Fixes #123
• meets the standards outlined in the accessibility guidelines