Schemas: Generate CRDs for core kinds (#62641)

Co-authored-by: sam boyer <sdboyer@grafana.com>

pkg/codegen/jenny_basecorereg.go

@@ -33,11 +33,21 @@ func (gen *genBaseRegistry) JennyName() string {
 }
 
 func (gen *genBaseRegistry) Generate(kinds ...kindsys.Kind) (*codejen.File, error) {
+	cores := make([]kindsys.Core, 0, len(kinds))
+	for _, d := range kinds {
+		if corekind, is := d.(kindsys.Core); is {
+			cores = append(cores, corekind)
+		}
+	}
+	if len(cores) == 0 {
+		return nil, nil
+	}
+
 	buf := new(bytes.Buffer)
 	if err := tmpls.Lookup("kind_registry.tmpl").Execute(buf, tvars_kind_registry{
 		PackageName:       filepath.Base(gen.path),
 		KindPackagePrefix: filepath.ToSlash(filepath.Join("github.com/grafana/grafana", gen.kindrelroot)),
-		Kinds:             kinds,
+		Kinds:             cores,
 	}); err != nil {
 		return nil, fmt.Errorf("failed executing kind registry template: %w", err)
 	}