[build] RUN_TESTS missing unified tests

RUN_TESTS only executes cpu, opencl and cuda test programs.
The unified programs are compiled although never executed in RUN_TESTS.

Description
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master in 3.9.0

Reproducible Code and/or Steps
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System Information
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Arrayfire: 3.9.0 (master: Commit 01c89484)
Windows 10

Checklist
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- [ ] Using the latest available ArrayFire release
- [ ] GPU drivers are up to date

在建置組態中搜尋 RUN_TESTS，並將現有的 CPU、OpenCL 和 CUDA 命令與已編譯的統一測試程式進行比較。完成的標準是 RUN_TESTS 也會執行統一程式；在 Windows 10 上執行目標，並確認所有列出的測試群組都已執行。

由索引模型根據 Issue 內容生成。