Add periodic log message for loading items during restore (#3282)

#### 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
- [ ] 🐛 Bugfix
- [ ] 🗺️ Documentation
- [x] 🤖 Supportability/Tests
- [ ] 💻 CI/Deployment
- [ ] 🧹 Tech Debt/Cleanup

#### Issue(s)

*

#### Test Plan

- [x] 💪 Manual
- [ ] ⚡ Unit test
- [ ] 💚 E2E

src/internal/kopia/wrapper.go

@@ -413,6 +413,7 @@ func (w Wrapper) ProduceRestoreCollections(
 	}
 
 	var (
+		loadCount int
 		// Maps short ID of parent path to data collection for that folder.
 		cols = map[string]*kopiaDataCollection{}
 		el   = errs.Local()
@@ -451,6 +452,11 @@ func (w Wrapper) ProduceRestoreCollections(
 		}
 
 		c.streams = append(c.streams, ds)
+
+		loadCount++
+		if loadCount%1000 == 0 {
+			logger.Ctx(ctx).Infow("loading items from kopia", "loaded_count", loadCount)
+		}
 	}
 
 	// Can't use the maps package to extract the values because we need to convert
@@ -460,6 +466,8 @@ func (w Wrapper) ProduceRestoreCollections(
 		res = append(res, c)
 	}
 
+	logger.Ctx(ctx).Infow("done loading items from kopia", "loaded_count", loadCount)
+
 	return res, el.Failure()
 }