perf(actionsv2): execution target router (#10564)

# Which Problems Are Solved

The event execution system currently uses a projection handler that
subscribes to and processes all events for all instances. This creates a
high static cost because the system over-fetches event data, handling
many events that are not needed by most instances. This inefficiency is
also reflected in high "rows returned" metrics in the database.

# How the Problems Are Solved

Eliminate the use of a project handler. Instead, events for which
"execution targets" are defined, are directly pushed to the queue by the
eventstore. A Router is populated in the Instance object in the authz
middleware.

- By joining the execution targets to the instance, no additional
queries are needed anymore.
- As part of the instance object, execution targets are now cached as
well.
- Events are queued within the same transaction, giving transactional
guarantees on delivery.
- Uses the "insert many fast` variant of River. Multiple jobs are queued
in a single round-trip to the database.
- Fix compatibility with PostgreSQL 15

# Additional Changes

- The signing key was stored as plain-text in the river job payload in
the DB. This violated our [Secrets
Storage](https://zitadel.com/docs/concepts/architecture/secrets#secrets-storage)
principle. This change removed the field and only uses the encrypted
version of the signing key.
- Fixed the target ordering from descending to ascending.
- Some minor linter warnings on the use of `io.WriteString()`.

# Additional Context

- Introduced in https://github.com/zitadel/zitadel/pull/9249
- Closes https://github.com/zitadel/zitadel/issues/10553
- Closes https://github.com/zitadel/zitadel/issues/9832
- Closes https://github.com/zitadel/zitadel/issues/10372
- Closes https://github.com/zitadel/zitadel/issues/10492

---------

Co-authored-by: Stefan Benz <[email protected]>

internal/api/grpc/action/v2/query.go

@@ -11,6 +11,7 @@ import (
 	"github.com/zitadel/zitadel/internal/api/grpc/filter/v2"
 	"github.com/zitadel/zitadel/internal/command"
 	"github.com/zitadel/zitadel/internal/domain"
+	target_domain "github.com/zitadel/zitadel/internal/execution/target"
 	"github.com/zitadel/zitadel/internal/query"
 	"github.com/zitadel/zitadel/internal/zerrors"
 	"github.com/zitadel/zitadel/pkg/grpc/action/v2"
@@ -89,11 +90,11 @@ func targetToPb(t *query.Target) *action.Target {
 		SigningKey: t.SigningKey,
 	}
 	switch t.TargetType {
-	case domain.TargetTypeWebhook:
+	case target_domain.TargetTypeWebhook:
 		target.TargetType = &action.Target_RestWebhook{RestWebhook: &action.RESTWebhook{InterruptOnError: t.InterruptOnError}}
-	case domain.TargetTypeCall:
+	case target_domain.TargetTypeCall:
 		target.TargetType = &action.Target_RestCall{RestCall: &action.RESTCall{InterruptOnError: t.InterruptOnError}}
-	case domain.TargetTypeAsync:
+	case target_domain.TargetTypeAsync:
 		target.TargetType = &action.Target_RestAsync{RestAsync: &action.RESTAsync{}}
 	default:
 		target.TargetType = nil