fix(setup): split membership fields migration (#9230)

# Which Problems Are Solved

The membership fields migration timed out in certain cases. It also
tried to migrate instances which were already removed.

# How the Problems Are Solved

Revert the previous fix that combined the repeatable step for multiple
fill triggers. The membeship migration is now single-run as it might
take a lot of time. It is not worth making it repeatable. Instance IDs
of removed instances are skipped.

# Additional Changes

None

# Additional Context

Introduced in https://github.com/zitadel/zitadel/pull/9199

(cherry picked from commit ec5f18c168)

cmd/setup/41.go

@@ -0,0 +1,44 @@
+package setup
+
+import (
+	"context"
+
+	"github.com/zitadel/zitadel/internal/api/authz"
+	"github.com/zitadel/zitadel/internal/eventstore"
+	"github.com/zitadel/zitadel/internal/query/projection"
+	"github.com/zitadel/zitadel/internal/repository/instance"
+)
+
+type FillFieldsForInstanceDomains struct {
+	eventstore *eventstore.Eventstore
+}
+
+func (mig *FillFieldsForInstanceDomains) Execute(ctx context.Context, _ eventstore.Event) error {
+	instances, err := mig.eventstore.InstanceIDs(
+		ctx,
+		eventstore.NewSearchQueryBuilder(eventstore.ColumnsInstanceIDs).
+			OrderDesc().
+			AddQuery().
+			AggregateTypes("instance").
+			EventTypes(instance.InstanceAddedEventType).
+			Builder(),
+	)
+	if err != nil {
+		return err
+	}
+	for _, instance := range instances {
+		ctx := authz.WithInstanceID(ctx, instance)
+		if err := projection.InstanceDomainFields.Trigger(ctx); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (mig *FillFieldsForInstanceDomains) String() string {
+	return "repeatable_fill_fields_for_instance_domains"
+}
+
+func (f *FillFieldsForInstanceDomains) Check(lastRun map[string]interface{}) bool {
+	return true
+}