Skip item if metadata fetch fails with 404 (#4001)

<!-- PR description-->

GET permissions fails if the item doesn't exist. We are hitting sanity test failures due to a race condition between test run & purge scripts.
`getting item metadata: getting item metadata: error status code received from the API: Item not found:`

Fix here is to ignore GET permissions failure if it returns not found. This is safe to do here, since the graph call for permissions [looks up the item by id](https://github.com/alcionai/corso/blob/main/src/pkg/services/m365/api/drive.go#L254C17-L254C17), and not the permissions by id. Hence, we can safely assume that the item that this permission is tied to has been deleted.

---

#### 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. -->
* https://github.com/alcionai/corso/issues/3998

#### Test Plan

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

src/internal/m365/onedrive/collection.go

@@ -512,10 +512,14 @@ func (oc *Collection) populateDriveItem(
 		metaSuffix = metadata.DirMetaFileSuffix
 	}
 
-	// Fetch metadata for the file
+	// Fetch metadata for the item
 	itemMeta, itemMetaSize, err = downloadItemMeta(ctx, oc.handler, oc.driveID, item)
 	if err != nil {
-		errs.AddRecoverable(ctx, clues.Wrap(err, "getting item metadata").Label(fault.LabelForceNoBackupCreation))
+		// Skip deleted items
+		if !clues.HasLabel(err, graph.LabelStatus(http.StatusNotFound)) && !graph.IsErrDeletedInFlight(err) {
+			errs.AddRecoverable(ctx, clues.Wrap(err, "getting item metadata").Label(fault.LabelForceNoBackupCreation))
+		}
+
 		return
 	}
 

src/pkg/services/m365/api/drive.go

@@ -255,7 +255,7 @@ func (c Drives) GetItemPermission(
 		Permissions().
 		Get(ctx, nil)
 	if err != nil {
-		return nil, graph.Wrap(ctx, err, "getting item metadata").With("item_id", itemID)
+		return nil, graph.Wrap(ctx, err, "getting item permission").With("item_id", itemID)
 	}
 
 	return perm, nil