Refactor User Invite

[qad114]

Refactor User Invite

Issue Number(s): #167

What does this PR change and why? Refactors how users are invited on the backend to allow Google sign-in to work correctly.

Checklist

• [ ] Requirements have been implemented
• [ ] Acceptance criteria is met
• [ ] Database schema docs have been updated or are not necessary
• [ ] Relevant reviewers (EM) have been assigned to this PR

Critical Changes

• Database change / migration to run
• Environment config change
• Breaking API change

Related PRs

PR Number(s): #number_of_pr

How To Test

Google sign-in should work correctly for invited users

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