Don't link temporary account and named account in newusers log
Why:
- When a temporary account creates a named account, the 'newusers' log currently links the temporary account username and the new named account.
- This is an issue because temporary accounts are intended to be anonymous and there is no path for a temporary account to link their contributions to their new account. As such, there should be no link between them.
What:
- Update AuthManager::continueAccountCreation to only mark the performer of the 'newusers' log entry as the creator account if the creator is named.
Bug: T364716
Change-Id: Ib95374949c5c72c9f7ee665943c16d177f2e31c0