Make test runner auto detect runnable tests

The current test runner requires each test file to be explicitly added to a list of tests in the run.lua file, this has created a point of pain when merging multiple branches together as it is common to have conflicts in this file. Change the runner to auto detect the tests needed to be run so we no longer get the merging issues.

首先阅读 run.lua，并跟踪当前显式测试列表是如何组装和执行的。运行现有的测试运行器以确定其当前行为，然后验证可运行的测试文件是否会被发现并执行，而无需编辑中央列表，包括添加新的测试文件时也是如此。

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