schema: Migrate from scuemata to thema (#49805)

* Remove crufty scuemata bits

Buhbye to: cue/ dir with old definitions, CI steps for checking unnecessary
things, and the original dashboard scuemata file.

* Remove grafana-cli cue subcommand

* Remove old testdata

* Don't swallow errors from codegen

* Small nits and tweaks to cuectx package

* WIP - refactor pluggen to use Thema

Also consolidate the embed.FS in the repo root.

* Finish halfway rename

* Convert all panel models.cue to thema

* Rewrite pluggen to use Thema

* Remove pkg/schema, and trim command

* Remove schemaloader service and usages

Will be replaced by coremodel-centric hydrate/dehydrate system Soon™.

* Remove schemaloader from wire

* Remove hangover field on histogram models.cue

* Fix lint errors, some vestiges of trim service

* Remove unused cuetsify cli command

pkg/api/http_server.go

@@ -64,7 +64,6 @@ import (
 	"github.com/grafana/grafana/pkg/services/queryhistory"
 	"github.com/grafana/grafana/pkg/services/quota"
 	"github.com/grafana/grafana/pkg/services/rendering"
-	"github.com/grafana/grafana/pkg/services/schemaloader"
 	"github.com/grafana/grafana/pkg/services/search"
 	"github.com/grafana/grafana/pkg/services/searchusers"
 	"github.com/grafana/grafana/pkg/services/secrets"
@@ -122,7 +121,6 @@ type HTTPServer struct {
 	ContextHandler               *contexthandler.ContextHandler
 	SQLStore                     sqlstore.Store
 	AlertEngine                  *alerting.AlertEngine
-	LoadSchemaService            *schemaloader.SchemaLoaderService
 	AlertNG                      *ngalert.AlertNG
 	LibraryPanelService          librarypanels.Service
 	LibraryElementService        libraryelements.Service
@@ -180,8 +178,7 @@ func ProvideHTTPServer(opts ServerOptions, cfg *setting.Cfg, routeRegister routi
 	dataSourceProxy *datasourceproxy.DataSourceProxyService, searchService *search.SearchService,
 	live *live.GrafanaLive, livePushGateway *pushhttp.Gateway, plugCtxProvider *plugincontext.Provider,
 	contextHandler *contexthandler.ContextHandler, features *featuremgmt.FeatureManager,
-	schemaService *schemaloader.SchemaLoaderService, alertNG *ngalert.AlertNG,
-	libraryPanelService librarypanels.Service, libraryElementService libraryelements.Service,
+	alertNG *ngalert.AlertNG, libraryPanelService librarypanels.Service, libraryElementService libraryelements.Service,
 	quotaService *quota.QuotaService, socialService social.Service, tracer tracing.Tracer, exportService export.ExportService,
 	encryptionService encryption.Internal, grafanaUpdateChecker *updatechecker.GrafanaService,
 	pluginsUpdateChecker *updatechecker.PluginsService, searchUsersService searchusers.Service,
@@ -237,7 +234,6 @@ func ProvideHTTPServer(opts ServerOptions, cfg *setting.Cfg, routeRegister routi
 		LivePushGateway:              livePushGateway,
 		PluginContextProvider:        plugCtxProvider,
 		ContextHandler:               contextHandler,
-		LoadSchemaService:            schemaService,
 		AlertNG:                      alertNG,
 		LibraryPanelService:          libraryPanelService,
 		LibraryElementService:        libraryElementService,