[OIDC Enrollment] Add testing for OIDC Guest/OTR mode change (from crrev.com/c/5604860)

Add missing test coverage for changes from crrev.com/c/5604860, where we allow OIDC enrollment to skip OTR profiles to prevent crash.

Also add a similar check for Guest session profiles.

Bug: 335677156

Change-Id: Ib985a01730ceef536cfcac675842d0eff46877f7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5618251


Reviewed-by: Igor Ruvinov <igorruvinov@chromium.org>
Commit-Queue: Zonghan Xu <xzonghan@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1313695}