Consider not adding a CakeBuildLog as fallback to all loggers

Is it real world use case that a build system logger is registered after checking the respective environment variable and that changes throughout execution?

Does it really need to be checked on every log event and have a `CakeBuildLog` fallback?

首先定位 issue 中提到的 logger 注册、环境变量检查和 CakeBuildLog fallback。跟踪这些选择如何影响每个日志事件，然后确定注册是否可以在执行过程中发生变化，并在添加有针对性的覆盖之前定义预期行为。

由索引模型根据 Issue 内容生成。