build: use correct frr image for metallb (#1102)

**What problem does this PR solve?**:
Use the helm values for Metallb images, with this fix:
```
$ make list-images
...
quay.io/frrouting/frr:9.1.3
quay.io/metallb/controller:v0.14.9
quay.io/metallb/speaker:v0.14.9
...
```

**Which issue(s) this PR fixes**:
Fixes #

**How Has This Been Tested?**:
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Author: dkoshkin

hack/tools/fetch-images/main.go

@@ -316,6 +316,8 @@ func getValuesFileForChartIfNeeded(chartName, carenChartDirectory string) (strin
 		return tempFile.Name(), nil
 	case "cosi-controller":
 		return filepath.Join(carenChartDirectory, "addons", "cosi", "controller", defaultHelmAddonFilename), nil
+	case "metallb":
+		return filepath.Join(carenChartDirectory, "addons", "serviceloadbalancer", "metallb", defaultHelmAddonFilename), nil
 	default:
 		return "", nil
 	}