We've encountered an error where the user previously had sharing for
one or more external users on an item and then did a backup. They
subsequently disabled sharing for the SharePoint site in either the
tenant-wide config or for the site in particular. Once sharing was
disabled, they attempted a restore which subsequently failed while
trying to restore sharing for the external user
This PR logs and ignores errors about sharing being disabled when
doing a restore
This has been tested manually
---
#### Does this PR need a docs update or release note?
- [x] ✅ Yes, it's included
- [ ] 🕐 Yes, but in a later PR
- [ ] ⛔ No
#### Type of change
- [ ] 🌻 Feature
- [x] 🐛 Bugfix
- [ ] 🗺️ Documentation
- [ ] 🤖 Supportability/Tests
- [ ] 💻 CI/Deployment
- [ ] 🧹 Tech Debt/Cleanup
#### Test Plan
- [x] 💪 Manual
- [x] ⚡ Unit test
- [ ] 💚 E2E
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