fix(providers): optional chaining in azure-ad-b2c profile (#8616)

Fix crash in azure-ad-b2c.ts

Not all b2c-setups return a list of emails. This fixes the resulting crash by using defensive access when setting the profile email address field.

Co-authored-by: Thang Vu <hi@thvu.dev>

packages/core/src/providers/azure-ad-b2c.ts

@@ -118,7 +118,7 @@ export default function AzureADB2C(
       return {
         id: profile.sub,
         name: profile.name,
-        email: profile.emails[0],
+        email: profile?.emails?.[0],
         image: null,
       }
     },