Remove ownerIndex from NetworkObjectComponent

[HexaField]

Summary

Slightly reduces complexity of netcode by reducing sources of truth for the userIndex of an object's owner, forcing the userIndex to be foudn via the ownerId on NetworkObjectComponent

Checklist

• Pre-push checks pass npm run check
  • Linter passing via npm run lint
  • Unit & Integration tests passing via npm run test:packages
  • Docker build process passing via npm run build-client
• If this PR is still a WIP, convert to a draft
• When this PR is ready, mark it as "Ready for review"
• Changes have been manually QA'd
• Changes reviewed by at least 2 approved reviewers

References

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QA Steps

1. git checkout pr_branch_name
2. npm install
3. npm run dev-reinit
4. npm run dev

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