Account linking for a org forking from US to EU region with SSO requires all users to recover their password

### Problem Statement

Currently account linking for a organisation fork from US to EU region with SSO is painful, as hundreds of users need to reset their password to link their accounts.

The current situation is that the US org has provisioned members through their SSO -> Then in the EU org these members are forked and saved as Email/Password because the SSO integration has to be setup again. -> Once these users try to login, sentry will prompt that there are 2 accounts and in order for us to merge them they'll need to fill in a password. (which they don't have)

I foresee that this will happen to any customer that is moving from US -> EU org with SSO or the other way around for that matter.

### Solution Brainstorm

We need a permanent fix for this!

For now there is a workaround would be available right now:
- For the user to go through Password forgotten and reset their password to make claim to the account and merge the accounts together. This only needs to happen once.

### Product Area

Settings - Auth

Start by tracing the Settings - Auth account-linking flow for users provisioned through SSO and forked between US and EU organizations. Confirm the desired permanent behavior for merging duplicate Email/Password and SSO accounts without requiring password recovery; no files or tests are named in the issue.

Written by the indexing model from the issue text.