[ErrorProne] remove voidUsed check

[stankiewicz]

Enable error prone check and fix violation.

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Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances code quality by enabling the VoidUsed ErrorProne check, which helps prevent incorrect usage of java.lang.Void. It also includes a direct fix for a detected violation, ensuring better adherence to coding standards and improving the robustness of the codebase.

Highlights

• ErrorProne Configuration: The VoidUsed ErrorProne check was enabled by removing it from the list of disabled checks in the Gradle build configuration.
• Code Fix: An existing violation of the VoidUsed check was resolved in FlinkKeyUtilsTest.java by refactoring a test case to directly pass null instead of assigning it to a Void variable.

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