Move SignedInUser to user service and RoleType and Roles to org (#53445)

* Move SignedInUser to user service and RoleType and Roles to org

* Use go naming convention for roles

* Fix some imports and leftovers

* Fix ldap debug test

* Fix lint

* Fix lint 2

* Fix lint 3

* Fix type and not needed conversion

* Clean up messages in api tests

* Clean up api tests 2

pkg/services/ngalert/eval/eval.go

@@ -15,10 +15,11 @@ import (
 	"github.com/grafana/grafana/pkg/expr"
 	"github.com/grafana/grafana/pkg/expr/classic"
 	"github.com/grafana/grafana/pkg/infra/log"
-	m "github.com/grafana/grafana/pkg/models"
 	"github.com/grafana/grafana/pkg/services/datasources"
 	"github.com/grafana/grafana/pkg/services/ngalert/models"
+	"github.com/grafana/grafana/pkg/services/org"
 	"github.com/grafana/grafana/pkg/services/secrets"
+	"github.com/grafana/grafana/pkg/services/user"
 	"github.com/grafana/grafana/pkg/setting"
 
 	"github.com/grafana/grafana-plugin-sdk-go/backend"
@@ -195,9 +196,9 @@ func getExprRequest(ctx AlertExecCtx, data []models.AlertQuery, now time.Time, d
 			if expr.IsDataSource(q.DatasourceUID) {
 				ds = expr.DataSourceModel()
 			} else {
-				ds, err = dsCacheService.GetDatasourceByUID(ctx.Ctx, q.DatasourceUID, &m.SignedInUser{
+				ds, err = dsCacheService.GetDatasourceByUID(ctx.Ctx, q.DatasourceUID, &user.SignedInUser{
 					OrgId:   ctx.OrgID,
-					OrgRole: m.ROLE_ADMIN, // Get DS as admin for service, API calls (test/post) must check permissions based on user.
+					OrgRole: org.RoleAdmin, // Get DS as admin for service, API calls (test/post) must check permissions based on user.
 				}, true)
 				if err != nil {
 					return nil, err