fix: re-implement chat analytics

[lorenzo-ranciaffi]

Pull Request Description

Fixes #5648
Fixes #5709

What does this PR change?

This PR reintroduces the analytics for chat:

• select a new conversation
• close a conversation
  by plugging into the new architecture's proper commands.

In order to avoid duplicate analytics entries, some small fixes have been applied, such as the removal of dead event subscriptions to pooled objects.

Test Instructions

Test Steps

1. Just test that the chat works as normal
2. Include log out/log in to verify everything works as normal

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	f8dc4af
Logs	https://github.com/decentraland/unity-explorer/actions/runs/18410374251
Download Windows	https://github.com/decentraland/unity-explorer/suites/47359944887/artifacts/4244880910
Download Windows S3	https://explorer-artifacts.decentraland.org/@dcl/unity-explorer/branch/fix/5648-chat-analytics/pr-14874-f8dc4af/Decentraland_windows64.zip
Download Mac	https://github.com/decentraland/unity-explorer/suites/47359944887/artifacts/4244842276
Download Mac S3	https://explorer-artifacts.decentraland.org/@dcl/unity-explorer/branch/fix/5648-chat-analytics/pr-14874-f8dc4af/Decentraland_macos.zip
Built on	2025-10-11T14:51:24Z

[anicalbano]

Also fixes #5709

[DafGreco]

✔️ PR reviewed and approved by QA on both platforms following instructions playing both happy and un-happy path

Regressions for this ticket had been performed in order to verify that the normal flow is working as expected:

• [✔️ ] On boarding with new account
• [✔️ ] Log In/Log Out
• [✔️ ] Backpack and wearables in world
• [✔️ ] Emotes in world and in backpack
• [✔️ ] Teleport with map/coordinates/Jump In
• [✔️ ] Chat and multiplayer
• [✔️ ] Profile card
• [✔️ ] Camera
• [✔️ ] Skybox
• [ ✔️] Settings

Evidence :

20251013-0810-28.8918676.mp4

20251013-0812-45.4988348.mp4