Kindsys: Remove Raw kind category (#60992)

* Remove Raw references

* Remove more raws

* Re-generate files

* Remove raw folder from veneer

* Fix import

* Fix lint

* Bring back raw folder in grafana-schema

* Another lint

* Remove use of "Structured" word in kinds

* Delete unused function and remove some structured words

* Bunch more removals of structured name

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

pkg/plugins/manager/testdata/disallowed-cue-import/models.cue

@@ -2,7 +2,7 @@ package grafanaplugin
 
 import (
 	"github.com/grafana/thema"
-	"github.com/grafana/grafana/kinds/structured/dashboard:kind"
+	"github.com/grafana/grafana/kinds/dashboard:kind"
 )
 
 _dummy: coremodel.slots