ref: pass tracer to plugin factory func (#93701)

* ref: pass tracer to plugin factory func

* fix: add tracer to coreplugin

* test: fix test, generate wire

* test: ignore trace field in loader_test

* ref: pass tracer as dependency, don't store in plugin

* ref: wrap tracer with tracer provider to satisfy WithTracerProvider

* ref: use otel trace.Tracer type for tracer

pkg/plugins/backendplugin/coreplugin/registry.go

@@ -254,7 +254,7 @@ func NewPlugin(pluginID string, cfg *setting.Cfg, httpClientProvider *httpclient
 	if backendFactory == nil {
 		return nil, ErrCorePluginNotFound
 	}
-	bp, err := backendFactory(p.ID, p.Logger(), nil)
+	bp, err := backendFactory(p.ID, p.Logger(), tracer, nil)
 	if err != nil {
 		return nil, err
 	}