feat(login): use default org for login without provided org context (#6625)

* start feature flags

* base feature events on domain const

* setup default features

* allow setting feature in system api

* allow setting feature in admin api

* set settings in login based on feature

* fix rebasing

* unit tests

* i18n

* update policy after domain discovery

* some changes from review

* check feature and value type

* check feature and value type

internal/api/grpc/admin/feature.go

@@ -0,0 +1,20 @@
+package admin
+
+import (
+	"context"
+
+	object_pb "github.com/zitadel/zitadel/internal/api/grpc/object"
+	"github.com/zitadel/zitadel/internal/domain"
+	admin_pb "github.com/zitadel/zitadel/pkg/grpc/admin"
+)
+
+func (s *Server) ActivateFeatureLoginDefaultOrg(ctx context.Context, _ *admin_pb.ActivateFeatureLoginDefaultOrgRequest) (*admin_pb.ActivateFeatureLoginDefaultOrgResponse, error) {
+	details, err := s.command.SetBooleanInstanceFeature(ctx, domain.FeatureLoginDefaultOrg, true)
+	if err != nil {
+		return nil, err
+	}
+	return &admin_pb.ActivateFeatureLoginDefaultOrgResponse{
+		Details: object_pb.DomainToChangeDetailsPb(details),
+	}, nil
+
+}