fix: actions v2 circular check for includes (#7563)

Add a check for circular includes in action v2 executions, so that no
self-includes or infinite loops can happen.

Closes #7445 

### Definition of Ready

- [x] I am happy with the code
- [x] Short description of the feature/issue is added in the pr
description
- [x] PR is linked to the corresponding user story
- [x] Acceptance criteria are met
- [x] All open todos and follow ups are defined in a new ticket and
justified
- [x] Deviations from the acceptance criteria and design are agreed with
the PO and documented.
- [x] No debug or dead code
- [x] My code has no repetitions
- [x] Critical parts are tested automatically
- [x] Where possible E2E tests are implemented
- [x] Documentation/examples are up-to-date
- [x] All non-functional requirements are met
- [x] Functionality of the acceptance criteria is checked manually on
the dev system.

---------

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

internal/command/action_v2_execution_model.go

@@ -3,6 +3,7 @@ package command
 import (
 	"slices"
 
+	"github.com/zitadel/zitadel/internal/domain"
 	"github.com/zitadel/zitadel/internal/eventstore"
 	"github.com/zitadel/zitadel/internal/repository/execution"
 )
@@ -15,6 +16,16 @@ type ExecutionWriteModel struct {
 	ExecutionTargets []*execution.Target
 }
 
+func (e *ExecutionWriteModel) IncludeList() []string {
+	includes := make([]string, 0)
+	for i := range e.ExecutionTargets {
+		if e.ExecutionTargets[i].Type == domain.ExecutionTargetTypeInclude {
+			includes = append(includes, e.ExecutionTargets[i].Target)
+		}
+	}
+	return includes
+}
+
 func (e *ExecutionWriteModel) Exists() bool {
 	return len(e.ExecutionTargets) > 0 || len(e.Includes) > 0 || len(e.Targets) > 0
 }