[BUG] ParentWorkflowInstanceId is not working as intended

## Description
Based on a support request in discord https://discord.com/channels/814605913783795763/1230144500777746493

## Steps to Reproduce
Using ootb server and studio 3.1.2/3.1.0 and create
* a GrandChild workflow
* a Child workflow that uses the Dispatch Workflow activity to dispatch GrandChild
* a Parent workflow that uses the Dispath Worklow activity to dispatch Child

[Parent-child-grandChild-workflow-definitions.zip](https://github.com/elsa-workflows/elsa-core/files/15021157/Parent-child-grandChild-workflow-definitions.zip)


Run the Parent workflow from Studio and check the WorkflowInstances table. The `ParentWorkflowInstanceId` is null for all instances.


## Expected Behavior
The `ParentWorkflowInstanceId` of

* GrandChild should be set to the Child instance Id
* Child should be set to the Parent instance id
* Parent should be null