Skip exporting SharePoint Libraries from Groups (#4258)

We currently don't have support for SP export in groups. Do not try to do them.

---

#### 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

<!--- Please check the type of change your PR introduces: --->
- [ ] 🌻 Feature
- [x] 🐛 Bugfix
- [ ] 🗺️ Documentation
- [ ] 🤖 Supportability/Tests
- [ ] 💻 CI/Deployment
- [ ] 🧹 Tech Debt/Cleanup

#### Issue(s)

<!-- Can reference multiple issues. Use one of the following "magic words" - "closes, fixes" to auto-close the Github issue. -->
* #<issue>

#### Test Plan

<!-- How will this be tested prior to merging.-->
- [ ] 💪 Manual
- [ ] ⚡ Unit test
- [ ] 💚 E2E

src/internal/m365/service/groups/export.go

@@ -38,6 +38,8 @@ func ProduceExportCollections(
 		switch cat {
 		case path.ChannelMessagesCategory:
 			folders = append(folders, fp.Folders()...)
+		default:
+			continue
 		}
 
 		coll := groups.NewExportCollection(