Plugins: Add synchronous CDN plugin loader (#99096)

* WIP

* Run plugin validations and validation steps sequentially if feature is off

* Remove dependency between sources.Service and pluginscdn.Service

* lint

* Parallelize validation only if class is CDN

* re-generate feature toggles

* remove waitgroup usage

* PR review: Add loader concurrency limit setting

* re-generate feature toggles

* pr review feedback

* fix const name

* Skip module.js validation for cdn plugins

* do not run validation steps in parallel

* lint

* reduce diff

* re-generate feature toggles

* lint

* pr review feedback

* remove leftover config.PluginManagementCfg from sources.Service

pkg/services/pluginsintegration/pluginsintegration.go

@@ -107,8 +107,6 @@ var WireSet = wire.NewSet(
 	wire.Bind(new(repo.Service), new(*repo.Manager)),
 	licensing.ProvideLicensing,
 	wire.Bind(new(plugins.Licensing), new(*licensing.Service)),
-	wire.Bind(new(sources.Registry), new(*sources.Service)),
-	sources.ProvideService,
 	pluginSettings.ProvideService,
 	wire.Bind(new(pluginsettings.Service), new(*pluginSettings.Service)),
 	filestore.ProvideService,
@@ -146,6 +144,8 @@ var WireExtensionSet = wire.NewSet(
 	wire.Bind(new(plugins.Client), new(*backend.MiddlewareHandler)),
 	managedplugins.NewNoop,
 	wire.Bind(new(managedplugins.Manager), new(*managedplugins.Noop)),
+	sources.ProvideService,
+	wire.Bind(new(sources.Registry), new(*sources.Service)),
 )
 
 func ProvideClientWithMiddlewares(