Chore: Implement OpenTelemtry in Grafana (#42674)

* Separate Tracer interface to TracerService and Tracer

* Fix lint

* Fix:Make it possible to start spans for both opentracing and opentelemetry in ds proxy

* Add span methods, use span interface for rest of tracing

* Fix logs in tracing

* Fix tests that are related to tracing

* Fix resourcepermissions test

* Fix some tests

* Fix more tests

* Add TracingService to wire cli runner

* Remove GlobalTracer from bus

* Renaming test function

* Remove GlobalTracer from TSDB

* Replace GlobalTracer in api

* Adjust tests to the InitializeForTests func

* Remove GlobalTracer from services

* Remove GlobalTracer

* Remove bus.NewTest

* Remove Tracer interface

* Add InitializeForBus

* Simplify tests

* Clean up tests

* Rename TracerService to Tracer

* Update pkg/middleware/request_tracing.go

Co-authored-by: Marcus Efraimsson <marcus.efraimsson@gmail.com>

* Initialize tracer before passing it to SQLStore initialization in commands

* Remove tests for opentracing

* Set span attributes correctly, remove unnecessary trace initiliazation form test

* Add tracer instance to newSQLStore

* Fix changes due to rebase

* Add modified tracing middleware test

* Fix opentracing implementation tags

Co-authored-by: Marcus Efraimsson <marcus.efraimsson@gmail.com>

pkg/tsdb/prometheus/prometheus.go

@@ -14,6 +14,7 @@ import (
 	"github.com/grafana/grafana-plugin-sdk-go/backend/instancemgmt"
 	"github.com/grafana/grafana/pkg/infra/httpclient"
 	"github.com/grafana/grafana/pkg/infra/log"
+	"github.com/grafana/grafana/pkg/infra/tracing"
 	"github.com/grafana/grafana/pkg/plugins"
 	"github.com/grafana/grafana/pkg/plugins/backendplugin/coreplugin"
 	"github.com/grafana/grafana/pkg/setting"
@@ -32,15 +33,17 @@ const pluginID = "prometheus"
 type Service struct {
 	intervalCalculator intervalv2.Calculator
 	im                 instancemgmt.InstanceManager
+	tracer             tracing.Tracer
 }
 
-func ProvideService(cfg *setting.Cfg, httpClientProvider httpclient.Provider, pluginStore plugins.Store) (*Service, error) {
+func ProvideService(cfg *setting.Cfg, httpClientProvider httpclient.Provider, pluginStore plugins.Store, tracer tracing.Tracer) (*Service, error) {
 	plog.Debug("initializing")
 	im := datasource.NewInstanceManager(newInstanceSettings(httpClientProvider))
 
 	s := &Service{
 		intervalCalculator: intervalv2.NewCalculator(),
 		im:                 im,
+		tracer:             tracer,
 	}
 
 	factory := coreplugin.New(backend.ServeOpts{