fix: correct handling of removed targets (#9824)

# Which Problems Are Solved

In Actions v2, if a target is removed, which is still used in an
execution, the target is still listed when list executions.

# How the Problems Are Solved

Removed targets are now also removed from the executions.

# Additional Changes

To be sure the list executions include a check if the target is still
existing.

# Additional Context

None

Co-authored-by: Livio Spring <livio.a@gmail.com>

internal/query/projection/execution.go

@@ -9,6 +9,7 @@ import (
 	"github.com/zitadel/zitadel/internal/eventstore/handler/v2"
 	exec "github.com/zitadel/zitadel/internal/repository/execution"
 	"github.com/zitadel/zitadel/internal/repository/instance"
+	"github.com/zitadel/zitadel/internal/repository/target"
 )
 
 const (
@@ -78,6 +79,15 @@ func (p *executionProjection) Reducers() []handler.AggregateReducer {
 				},
 			},
 		},
+		{
+			Aggregate: target.AggregateType,
+			EventReducers: []handler.EventReducer{
+				{
+					Event:  target.RemovedEventType,
+					Reduce: p.reduceTargetRemoved,
+				},
+			},
+		},
 		{
 			Aggregate: instance.AggregateType,
 			EventReducers: []handler.EventReducer{
@@ -152,6 +162,21 @@ func (p *executionProjection) reduceExecutionSet(event eventstore.Event) (*handl
 	return handler.NewMultiStatement(e, stmts...), nil
 }
 
+func (p *executionProjection) reduceTargetRemoved(event eventstore.Event) (*handler.Statement, error) {
+	e, err := assertEvent[*target.RemovedEvent](event)
+	if err != nil {
+		return nil, err
+	}
+	return handler.NewDeleteStatement(
+		e,
+		[]handler.Condition{
+			handler.NewCond(ExecutionTargetInstanceIDCol, e.Aggregate().InstanceID),
+			handler.NewCond(ExecutionTargetTargetIDCol, e.Aggregate().ID),
+		},
+		handler.WithTableSuffix(ExecutionTargetSuffix),
+	), nil
+}
+
 func (p *executionProjection) reduceExecutionRemoved(event eventstore.Event) (*handler.Statement, error) {
 	e, err := assertEvent[*exec.RemovedEvent](event)
 	if err != nil {