When a user's email is renamed in the identity provider (e.g. Google
Workspace), the external ID stays the same but the email changes. The
SCIM CreateUser now falls back to external ID lookup when no profile is
found by identity, and reassociates the existing profile to the new
identity instead of failing with a 409 uniqueness error.
Also removes user emails from bridge sync error messages to avoid
logging PII, using external IDs instead.
Signed-off-by: Sacha Al Himdani <sacha@getprobo.com>
