Improve Fleet API response compatibility for version 9.x

[gurevichdmitry]

Motivation

Ensure consistent and accurate responses from Fleet API calls across all integrations in version 9.x, addressing any discrepancies introduced in recent updates.

Definition of done
What needs to be completed at the end of this task

• All integrations utilizing Fleet API calls are fully functional and tested on version 9.x.
• Verification that Fleet API responses conform to expected formats and data structures for 9.x.

Out of scope
What should not be included in this task

Related tasks/epics
Reference related issues and epics