Duplicate email invite when transitioning user base into SCIM managed state

### Environment SaaS (https://sentry.io/) ### Steps to Reproduce 1. Disable SCIM 2. Add member to org with user@emailA.com 3. Enable SSO 4. Enable SCIM 5. Member login with user@emailB.com ### Expected Result I would expect that after the identity of the member account gets merged, the member should be able to login with email B via SSO ### Actual Result A first invite gets sent to user@emailB.com when they try to log in for the first time. If the user now tries to log in with user@emailA.com before the invite sent to emailB is accepted, Sentry will send a duplicate invite and not try to merge the accounts [Internal Customer Case](https://www.notion.so/sentry/Issues-transitioning-user-base-into-SCIM-managed-state-2d0cb3fb2f37486fa50a3540388a52bf?pvs=4) ### Product Area Sign In ### Link _No response_ ### DSN _No response_ ### Version _No response_