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>

internal/logger/logonce.go

@@ -42,11 +42,9 @@ func (l *logOnceType) logOnceIf(ctx context.Context, err error, id interface{},
 	if prevErr == nil {
 		l.IDMap[id] = err
 		shouldLog = true
-	} else {
-		if prevErr.Error() != err.Error() {
-			l.IDMap[id] = err
-			shouldLog = true
-		}
+	} else if prevErr.Error() != err.Error() {
+		l.IDMap[id] = err
+		shouldLog = true
 	}
 	l.Unlock()