add gocritic/ruleguard checks back again, cleanup code. (#13665)

- remove some duplicated code
- reported a bug, separately fixed in #13664
- using strings.ReplaceAll() when needed
- using filepath.ToSlash() use when needed
- remove all non-Go style comments from the codebase

Co-authored-by: Aditya Manthramurthy <donatello@users.noreply.github.com>

cmd/admin-heal-ops.go

@@ -491,7 +491,7 @@ func (h *healSequence) getScannedItemsCount() int64 {
 	defer h.mutex.RUnlock()
 
 	for _, v := range h.scannedItemsMap {
-		count = count + v
+		count += v
 	}
 	return count
 }