Plugins: Always load decoupled frontend assets from builds (#81873)

* Wip

* Wip

* Adapt to load external module

* build: remove cloudmonitoring from built_in_plugins, clean up webpack output

* chore(plugins): remove decoupled plugins from package.json deps

* chore(codeowners): update file for nx.json

* revert(webpack): put back path in config

* build(frontend): use nx to run prod builds of decoupled plugins with yarn build

* style(prometheus): run prettier-write to fix tsconfig.json

* style(backend): remove unused subFile.isDistDir

* revert(locales): remove formatting changes adding new line at end of files

* chore(webpack): clean up dev output

* build(nx): make grafana an nx project, bump lerna and nx

* build(plugin-configs): move cache directory to node_modules

* style(datasource-plugins): add eslint ignore for .gen.ts files

* chore(codeowners): add frontend-ops as owner of project.json

* build(webpack): add getDecoupledPlugins to automatically ignore when watching

* ci(drone): skip nx cache when building frontend packages

* style(ci): fix missing trailing comma

* Revert "style(ci): fix missing trailing comma"

This reverts commit 7520d41576.

* Revert "ci(drone): skip nx cache when building frontend packages"

This reverts commit 46938883ac.

* feat(zipkin): remove from grafana core bundle

* chore(npm): bump nx package to latest 18.0.8

* docs(dev-guide): add a note about what yarn start now builds

---------

Co-authored-by: Andres Martinez <andres.martinez@grafana.com>

pkg/plugins/manager/loader/assetpath/assetpath.go

@@ -10,7 +10,6 @@ import (
 	"github.com/grafana/grafana/pkg/plugins"
 	"github.com/grafana/grafana/pkg/plugins/config"
 	"github.com/grafana/grafana/pkg/plugins/pluginscdn"
-	"github.com/grafana/grafana/pkg/services/featuremgmt"
 )
 
 // Service provides methods for constructing asset paths for plugins.
@@ -58,9 +57,7 @@ func (s *Service) Base(n PluginInfo) (string, error) {
 // Module returns the module.js path for the specified plugin.
 func (s *Service) Module(n PluginInfo) (string, error) {
 	if n.class == plugins.ClassCore {
-		if s.cfg.Features != nil &&
-			s.cfg.Features.IsEnabledGlobally(featuremgmt.FlagExternalCorePlugins) &&
-			filepath.Base(n.dir) == "dist" {
+		if filepath.Base(n.dir) == "dist" {
 			// The core plugin has been built externally, use the module from the dist folder
 		} else {
 			baseDir := getBaseDir(n.dir)