IAM: Add role to User (#111256)

* codegen fix

* Return user role from the legacy store

* Lint

* Add tests, gen openapi

* make generate

* revert go.mod, go.sum, go.work.sum changes

* Update go.mod and go.sum

pkg/registry/apis/iam/common/models.go

@@ -0,0 +1,8 @@
+package common
+
+import "github.com/grafana/grafana/pkg/services/user"
+
+type UserWithRole struct {
+	user.User
+	Role string
+}