UVE: Enhance `isInsideEditor` Function in the SDK

[fmontes]

Parent

#28404

Task description

As a developer working on the dotCMS SDK, I need to improve the isInsideEditor function to make it more robust and secure. This function is crucial for determining whether a user is currently inside the dotCMS editor environment.

Acceptance Criteria

TBD

External Links

TBD

Assumptions & Initiation Needs

Currently, we're only checking if the client web app is inside an iframe, also the postMessage are not using specific origin (*).

Quality Assurance Notes & Workarounds

TBD

[fmontes]

This issue needs a clear path, we have no idea how to do this.

[zJaaal]

This function was deprecated in this issue #31090