Add identity for SAML sign-ups

[nickoferrall]

In AutoJoin, we check whether the user has an identity with isEmailVerified. However, if a user signs up with SAML, we don't add an identity.

AC

• [ ] In loginWithSAML, add an identity with isEmailVerified === true
• [ ] Remove the temporary fix in https://github.com/ParabolInc/parabol/pull/9189

[igorlesnenko]

See some work started here #9202

[github-actions[bot]]

Stale issue