Schemas: Refactor plugin's metadata (#83696)

* Remove kinds verification for kind-registry

* Read plugin's json information with json library instead of use thema binding

* Remove grafanaplugin unification

* Don't use kindsys for extract the slot name

* Fix IsGroup

* Remove all plugindef generation

* Refactor schema interfaces

* Pushed this change from a different branch by mistake...

* Create small plugin definition structure adding additional information for plugins registration

* Add some validation checks

* Delete unused code

* Fix imports lint

pkg/plugins/pfs/plugin.go

@@ -3,8 +3,6 @@ package pfs
 import (
 	"cuelang.org/go/cue/ast"
 	"github.com/grafana/kindsys"
-
-	"github.com/grafana/grafana/pkg/plugins/plugindef"
 )
 
 // ParsedPlugin represents everything knowable about a single plugin from static
@@ -14,7 +12,7 @@ import (
 // struct returned from [ParsePluginFS].
 type ParsedPlugin struct {
 	// Properties contains the plugin's definition, as declared in plugin.json.
-	Properties plugindef.PluginDef
+	Properties Metadata
 
 	// ComposableKinds is a map of all the composable kinds declared in this plugin.
 	// Keys are the name of the [kindsys.SchemaInterface] implemented by the value.