Why:
- Using an anonymous user object at the start of account creation helps
ensure that downstream code paths do not record the association
between a temporary account and a named account
What:
- Use an anonymous user object during account creation initiated by
temp account users
- Update the session to use the anonymous user and set the request
context user based on the session user
- Ensure the temp account username is removed from the session, to avoid
issues where account creation fails and code thinks that a temporary
account username is already defined for the session
- Add a test to exercise this code path
Bug: T393628
Change-Id: I6d2df8c1d842c4fefa916ed395479f479a0051eb
(cherry picked from commit 3d80e63f109834b90a83597d6d924895b2c6ae71)
9d3de690e0