Duplicate User Accounts Created in Sentry Due to Email Address Discrepancy with Okta Provisioning

### Environment

SaaS (https://sentry.io/)

### Steps to Reproduce

### Steps to Reproduce

1. Assign a new user to the Sentry application in Okta.
2. Ensure the user is created in Sentry with the `firstName.lastName@.com` email address.
3. Have the user accept the invitation and log in via Okta.
4. Observe that a duplicate account with the `employeenumber@.com` email address is created in Sentry.

### Expected Result

- Users should only have one account in Sentry with the `firstName.lastName@.com` email address.
- No duplicate accounts should be created with the `employeenumber@.com` email address.
- It should be possible to remove the employee number-based email account from Sentry if the user is unassigned from Okta.

### Actual Result

- Duplicate accounts are created in Sentry with the `employeenumber@.com` email address after the user logs in.
- We are unable to remove the employee number-based email account from Sentry.

### Product Area

Settings - Auth

### Link

I'll share in Case

### DSN

_No response_

### Version

_No response_

┆Issue is synchronized with this [Jira Improvement](https://getsentry.atlassian.net/browse/FEEDBACK-2196) by [Unito](https://www.unito.io)