graph has been inconsistent about what error code is returned
when the user doesn't exist. Expand the set of things we
check so that hopefully we'll get them all
Always return an error if the user doesn't exist as determined
by checking for exchange folders during GetInfo calls
Also add a little more stack trace info to returned errors
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#### Does this PR need a docs update or release note?
- [ ] ✅ Yes, it's included
- [ ] 🕐 Yes, but in a later PR
- [x] ⛔ No
#### Type of change
- [ ] 🌻 Feature
- [x] 🐛 Bugfix
- [ ] 🗺️ Documentation
- [ ] 🤖 Supportability/Tests
- [ ] 💻 CI/Deployment
- [ ] 🧹 Tech Debt/Cleanup
#### Issue(s)
* fixes#3672
#### Test Plan
- [x] 💪 Manual
- [x] ⚡ Unit test
- [ ] 💚 E2E