Add Feature to View Child and Descendant Workflow Instances in Elsa Studio

**Summary**: Implement a feature that enables users to view all child workflow instances related to a specific parent workflow instance, including all descendant workflows.

**Details**:
- Users should be able to easily identify and access child workflow instances directly from a parent workflow instance's details page.
- The feature should include the capability to view not just direct children but also further descendants, providing a comprehensive overview of workflow lineage.
- This enhancement aims to improve workflow management and monitoring capabilities within Elsa Studio, making it easier for users to track and understand the relationships and statuses of complex workflow hierarchies.
- The search filter must reflect the parent/ancestor instance of which the children/descendants are being displayed in the results list.

**Expected Benefits**:
- Enhanced user experience by providing a more intuitive way to navigate and monitor workflows and their relationships.
- Improved workflow management efficiency, especially for complex workflows involving multiple levels of child workflows.
- Better oversight and debugging capabilities for workflow administrators and designers.

This feature request arises from the need to enhance visibility and control over workflow instances, especially in complex scenarios where workflows are dynamically spawning other workflows. Implementing this feature would significantly contribute to the usability and robustness of Elsa Studio's workflow management capabilities.