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

.github/CODEOWNERS

@@ -624,10 +624,10 @@ playwright.config.ts @grafana/plugins-platform-frontend
 # Kind system and code generation
 embed.go @grafana/grafana-as-code
 /pkg/kinds/ @grafana/grafana-as-code
-/pkg/cuectx/ @grafana/grafana-as-code
 /pkg/registry/ @grafana/grafana-as-code
 /pkg/registry/apis/ @grafana/grafana-app-platform-squad
 /pkg/codegen/ @grafana/grafana-as-code
+/pkg/codegen/generators @grafana/grafana-as-code
 /pkg/kinds/*/*_gen.go @grafana/grafana-as-code
 /pkg/registry/schemas/ @grafana/grafana-as-code
 /public/app/plugins/*gen.go @grafana/grafana-as-code