fix: duplicated ids on video streaming

[lorux0]

What does this PR change?

In areas with numerous scenes, each containing video streams, there was a risk of duplicated IDs because only the entityId was used as the identifier for the videos.

The solution involves appending the scene number to the video streaming ID to ensure uniqueness.

How to test the changes?

1. Launch the explorer
2. Goto -1,89
3. Check that the video streaming of the scene is working
4. Walk around the event
5. Check that all of the video streamings are working

Our Code Review Standards

https://github.com/decentraland/unity-renderer/blob/master/docs/code-review-standards.md

Copilot summary

copilot:summary

[github-actions[bot]]

After the CI passes:

Web

This branch can be previewed at:

• https://play.decentraland.org/?explorer-branch=fix/streaming
• https://play.decentraland.zone/?explorer-branch=fix/streaming

Desktop:

If you have the launcher installed (download launcher) you can press open on the following link:

• Open custom protocol
• Open custom protocol with Developer Mode

SDK 7

• Open SDK7 scenes playground
• Open SDK7 goerli plaza scenes
• Open SDK7 test scenes

SDK 6

• Open SDK6 scenes in preview

More

• Code coverage report: https://renderer-artifacts.decentraland.org/branch-coverage/fix/streaming
• Benchmark report: https://renderer-artifacts.decentraland.org/branch-benchmark/fix/streaming/index.html