fix: native libs disposal to ensure graceful close

[davidejensen]

Pull Request Description

What does this PR change?

Fix #6819
This PR ensures that LiveKit, RustAudio and Segment are safely disposed when closing the game, to avoid crashes caused by the non disposal of those native libraries

Test Instructions

Just perform a smoke test and verify if the client crashes on closing, it could still happen but the majority of crashes on exit should be fixed

Additional Testing Notes

• Note any edge cases to verify
• Mention specific areas that need careful testing
• List known limitations or potential issues

Quality Checklist

• Changes have been tested locally
• Documentation has been updated (if required)
• Performance impact has been considered
• For SDK features: Test scene is included

Code Review Reference

Please review our Code Review Standards before submitting.

[github-actions]

Windows and Mac build successful in Unity Cloud! You can find a link to the downloadable artifact below.

Name	Link
Commit	6c591c4
Logs	https://github.com/decentraland/unity-explorer/actions/runs/21355587595
Download Windows	https://github.com/decentraland/unity-explorer/suites/55422618139/artifacts/5256622265
Download Windows S3	https://explorer-artifacts.decentraland.org/@dcl/unity-explorer/branch/fix/native-libs-disposal/pr-17905-6c591c4/Decentraland_windows64.zip
Download Mac	https://github.com/decentraland/unity-explorer/suites/55422618139/artifacts/5256700049
Download Mac S3	https://explorer-artifacts.decentraland.org/@dcl/unity-explorer/branch/fix/native-libs-disposal/pr-17905-6c591c4/Decentraland_macos.zip
Built on	2026-01-26T12:49:17Z