feat: option to disallow public org registration (#6917)

* feat: return 404 or 409 if org reg disallowed

* fix: system limit permissions

* feat: add iam limits api

* feat: disallow public org registrations on default instance

* add integration test

* test: integration

* fix test

* docs: describe public org registrations

* avoid updating docs deps

* fix system limits integration test

* silence integration tests

* fix linting

* ignore strange linter complaints

* review

* improve reset properties naming

* redefine the api

* use restrictions aggregate

* test query

* simplify and test projection

* test commands

* fix unit tests

* move integration test

* support restrictions on default instance

* also test GetRestrictions

* self review

* lint

* abstract away resource owner

* fix tests

* lint

internal/api/grpc/admin/server_integration_test.go

@@ -0,0 +1,32 @@
+//go:build integration
+
+package admin_test
+
+import (
+	"context"
+	"os"
+	"testing"
+	"time"
+
+	"github.com/zitadel/zitadel/internal/integration"
+)
+
+var (
+	AdminCTX, SystemCTX context.Context
+	Tester              *integration.Tester
+)
+
+func TestMain(m *testing.M) {
+	os.Exit(func() int {
+		ctx, _, cancel := integration.Contexts(3 * time.Minute)
+		defer cancel()
+
+		Tester = integration.NewTester(ctx)
+		defer Tester.Done()
+
+		AdminCTX = Tester.WithAuthorization(ctx, integration.IAMOwner)
+		SystemCTX = Tester.WithAuthorization(ctx, integration.SystemUser)
+
+		return m.Run()
+	}())
+}