Core: Remove thema and kindsys dependencies (#84499)

* Move some thema code inside grafana

* Use new codegen instead of thema for core kinds

* Replace TS generator

* Use new generator for go types

* Remove thema from oapi generator

* Remove thema from generators

* Don't use kindsys/thema for core kinds

* Remove kindsys/thema from plugins

* Remove last thema related

* Remove most of cuectx and move utils_ts into codegen. It also deletes wire dependency

* Merge plugins generators

* Delete thema dependency 🎉

* Fix CODEOWNERS

* Fix package name

* Fix TS output names

* More path fixes

* Fix mod codeowners

* Use original plugin's name

* Remove kindsys dependency 🎉

* Modify oapi schema and create an apply function to fix elasticsearch errors

* cue.mod was deleted by mistake

* Fix TS panels

* sort imports

* Fixing elasticsearch output

* Downgrade oapi-codegen library

* Update output ts files

* More fixes

* Restore old elasticsearch generated file and skip its generation. Remove core imports into plugins

* More lint fixes

* Add codeowners

* restore embed.go file

* Fix embed.go

pkg/tsdb/loki/parse_query.go

@@ -149,7 +149,7 @@ func parseQuery(queryContext *backend.QueryDataRequest) ([]*lokiQuery, error) {
 			return nil, err
 		}
 
-		expr := interpolateVariables(model.Expr, interval, timeRange, queryType, step)
+		expr := interpolateVariables(depointerizer(model.Expr), interval, timeRange, queryType, step)
 
 		direction, err := parseDirection(model.Direction)
 		if err != nil {
@@ -187,3 +187,12 @@ func parseQuery(queryContext *backend.QueryDataRequest) ([]*lokiQuery, error) {
 
 	return qs, nil
 }
+
+func depointerizer[T any](v *T) T {
+	var emptyValue T
+	if v != nil {
+		emptyValue = *v
+	}
+
+	return emptyValue
+}