Move InternalJobIndex to PartitionComponent

[AnsisMalins]

What does this PR change?

This change moves the InternalJobIndex property from ScenePartitionComponent to PartitionComponent. Reasons:

• ScenePartitionComponent is a value type, so every new instance is new, but PartitionComponent is a pooled reference type. Without this change, a new InternalJobIndex would be assigned to each new ScenePartitionComponent until we run out (the partition data buffer is preallocated to 90000 items). With this change, the job indices and partition datas are reused because the partition component instances are reused.
• InternalJobIndex points to a PartitionData. I believe that PartitionData better belongs to PartitionComponent and not SceneDefinitionComponent.

Do note that this is just the second in a series of many pull requests to refactor and optimize the partition components. The first one was #2833

How to test the changes?

1. Launch the explorer
2. Play normally
3. The game should work exactly the same as without this change

Our Code Review Standards

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

[github-actions]

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

Name	Link
Commit	fe7f43b
Logs	https://github.com/decentraland/unity-explorer/actions/runs/12115684448
Download Windows	https://github.com/decentraland/unity-explorer/suites/31542316492/artifacts/2260372627
Download Windows S3	https://explorer-artifacts.decentraland.org/@dcl/unity-explorer/branch/partition-component-internaljobindex/Decentraland_windows64.zip
Download Mac	https://github.com/decentraland/unity-explorer/suites/31542316492/artifacts/2260409818
Download Mac S3	https://explorer-artifacts.decentraland.org/@dcl/unity-explorer/branch/partition-component-internaljobindex/Decentraland_macos.zip
Built on	2024-12-02T09:25:10Z