Changelog for Demo Generator 26.2.0

Changes

• story_modeller: Don’t allow duplicate names for story entities (PR, #7488)
• story_modeller: display list of stories where event/incident templates are used (PR, #7503)
• trinity: Rename the generator to Trinity Task Manager
• trinity: Make timeouts section collapsible and collapse it by default (PR)
• trinity: Enhance assets with additional configuration (PR, #7570)
• Add Task management generator for Trinity (PR)