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/codegen/util_go.go

@@ -27,21 +27,6 @@ func PrefixDropper(prefix string) dstutil.ApplyFunc {
 	}).applyfunc
 }
 
-// PrefixReplacer returns a dstutil.ApplyFunc that removes the provided prefix
-// string when it appears as a leading sequence in type names, var names, and
-// comments in a generated Go file.
-//
-// When an exact match for prefix is found, the provided replace string
-// is substituted.
-func PrefixReplacer(prefix, replace string) dstutil.ApplyFunc {
-	return (&prefixmod{
-		prefix:  prefix,
-		replace: replace,
-		rxpsuff: regexp.MustCompile(fmt.Sprintf(`%s([a-zA-Z_]+)`, prefix)),
-		rxp:     regexp.MustCompile(fmt.Sprintf(`%s([\s.,;-])`, prefix)),
-	}).applyfunc
-}
-
 func depoint(e dst.Expr) dst.Expr {
 	if star, is := e.(*dst.StarExpr); is {
 		return star.X