Chore: Move ReqContext to contexthandler service (#62102)

* Chore: Move ReqContext to contexthandler service

* Rename package to contextmodel

* Generate ngalert files

* Remove unused imports

pkg/services/accesscontrol/resourcepermissions/api_test.go

@@ -15,9 +15,9 @@ import (
 	"github.com/stretchr/testify/require"
 
 	"github.com/grafana/grafana/pkg/infra/log"
-	"github.com/grafana/grafana/pkg/models"
 	"github.com/grafana/grafana/pkg/services/accesscontrol"
 	"github.com/grafana/grafana/pkg/services/contexthandler/ctxkey"
+	contextmodel "github.com/grafana/grafana/pkg/services/contexthandler/model"
 	"github.com/grafana/grafana/pkg/services/org/orgimpl"
 	"github.com/grafana/grafana/pkg/services/quota/quotatest"
 	"github.com/grafana/grafana/pkg/services/sqlstore"
@@ -444,7 +444,7 @@ type testContext struct {
 func contextProvider(tc *testContext) web.Handler {
 	return func(c *web.Context) {
 		signedIn := tc.user != nil
-		reqCtx := &models.ReqContext{
+		reqCtx := &contextmodel.ReqContext{
 			Context:      c,
 			SignedInUser: tc.user,
 			IsSignedIn:   signedIn,