Codegen: Generate docs for composable kinds (#61719)

* Generate docs for composable kinds

* Fix getting the kind schema

* Generate composable kinds docs

* Add disclaimer to the generated docs

* Change docs disclaimer

pkg/plugins/codegen/jenny_plugindocs.go

@@ -0,0 +1,28 @@
+package codegen
+
+import (
+	"github.com/grafana/codejen"
+	"github.com/grafana/grafana/pkg/plugins/pfs"
+)
+
+func PluginDocsJenny(inner codejen.OneToOne[*pfs.PluginDecl]) codejen.OneToOne[*pfs.PluginDecl] {
+	return &docsJenny{
+		inner: inner,
+	}
+}
+
+type docsJenny struct {
+	inner codejen.OneToOne[*pfs.PluginDecl]
+}
+
+func (j *docsJenny) JennyName() string {
+	return "PluginDocsJenny"
+}
+
+func (j *docsJenny) Generate(decl *pfs.PluginDecl) (*codejen.File, error) {
+	if !decl.HasSchema() {
+		return nil, nil
+	}
+
+	return j.inner.Generate(decl)
+}