(helm/v2-alpha) `kubebuilder edit` hangs forever if dist/install.yaml is malformed

## What broke? What's expected? `extractNamespaceFromManifests` in `pkg/plugins/optional/helm/v2alpha/edit.go` does `continue` on YAML decode errors: ```go if err := decoder.Decode(&doc); err != nil { if err == io.EOF { break } continue } ``` After a syntax error the yaml/v3 decoder returns the same error on every call, so the loop never makes progress. A malformed `dist/install.yaml` makes `kubebuilder edit --plugins=helm/v2-alpha` hang forever. Expected: bail out on any non-EOF error and fall back to the default namespace (`<project>-system`), as the function already does in other failure cases. ## Suggested fix Replace `continue` with `break`. A regression test fits next to the existing tests in `edit_test.go`. ## KubeBuilder (CLI) Version master (introduced by #5442)