UUM-134930: [2.10.x] Converted remaining references from instanceID to entityID.

[sim-bz]

Purpose of this PR

https://jira.unity3d.com/browse/UUM-134930

Testing status

[Explanation of what’s tested, how tested and existing or new automation tests. Can include manual testing by self and/or QA. Specify test plans. Rarely acceptable to have no testing.]

• Added an automated test
• Passed all automated tests
• Manually tested

Documentation status

[Overview of how documentation is affected by this change. If there is no effect on documentation, explain why. Otherwise, state which sections are changed and why.]

• Updated CHANGELOG
• Updated README (if applicable)
• Commented all public classes, properties, and methods
• Updated user documentation

Technical risk

[Overall product level assessment of risk of change. Need technical risk & halo effect.]

Comments to reviewers

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Package version

[Justification for updating either the patch, minor, or major version according to the semantic versioning rules]

• Updated package version

[u-pr]

PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

🎫 Ticket compliance analysis ✅ UUM-134930 - PR Code Verified Compliant requirements: Replaced EditorApplication.hierarchyWindowItemOnGUI with EditorApplication.hierarchyWindowItemByEntityIdOnGUI using #if UNITY_6000_4_OR_NEWER. Replaced EditorUtility.InstanceIDToObject(int) with EditorUtility.EntityIdToObject using #if UNITY_6000_4_OR_NEWER. Method OnHierarchyGUI updated to accept EntityId instead of int instanceID for versions 6000.4 and newer. Requires further human verification: Verify that UNITY_6000_4_OR_NEWER is the correct preprocessor define corresponding to Unity 6.4 where these APIs became available and implicitly casting was obsoleted.

⏱️ Estimated effort to review: 1 🔵⚪⚪⚪⚪ The PR is very small, straightforward, and clearly addresses the API deprecation issue using standard preprocessor directives.

🏅 Score: 100 The code perfectly addresses the deprecation warnings using standard C# preprocessor blocks, correctly maintaining backwards compatibility for earlier Unity versions.

🧪 No relevant tests

🔒 No security concerns identified

⚡ No major issues detected

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[u-pr]

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