Kindsys: Unify plugins, pfs with kind framework (#61192)

* New pfs impl

* Reached codegen parity with old system

* Update all models.cue inputs

* Rename all models.cue files

* Remove unused prefixfs

* Changes Queries->DataQuery schema interface

* Recodegen

* All tests passing, nearly good now

* Add SchemaInterface to kindsys props

* Add pascal name deriver

* Relocate plugin cue files again

* Clarify use of injected fields

* Remove unnecessary aliasing

* Move DataQuery into mudball

* Allow forcing ExpandReferences on go type generation

* Move DataQuery def into kindsys, add generator to copy it to common

* Fix copy generator to replace package name correctly

* Fix duplicate type, test failure

* Fix linting issues

pkg/plugins/pfs/plugin_test.go

@@ -0,0 +1,31 @@
+package pfs
+
+import (
+	"sort"
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+	"github.com/grafana/grafana/pkg/kindsys"
+)
+
+// This is a brick-dumb test that just ensures known schema interfaces are being
+// loaded correctly from their declarations in .cue files.
+//
+// If this test fails, it's either because:
+// - They're not being loaded correctly - there's a bug in kindsys or pfs somewhere, fix it
+// - The set of schema interfaces has been modified - update the static list here
+func TestSchemaInterfacesAreLoaded(t *testing.T) {
+	knownSI := []string{"PanelCfg", "DataQuery", "DataSourceCfg"}
+	all := kindsys.SchemaInterfaces(nil)
+	var loadedSI []string
+	for k := range all {
+		loadedSI = append(loadedSI, k)
+	}
+
+	sort.Strings(knownSI)
+	sort.Strings(loadedSI)
+
+	if diff := cmp.Diff(knownSI, loadedSI); diff != "" {
+		t.Fatalf("kindsys cue-declared schema interfaces differ from ComposableKinds go struct:\n%s", diff)
+	}
+}