Move EXECUTORCH_LOG_LEVEL to default preset (#10799)

### Summary
TSIA

### Test plan

CI +

```
$ cmake --preset macos-arm64 && cmake --build cmake-out --parallel
```
```
$ cmake -DEXECUTORCH_LOG_LEVEL=fake --preset macos-arm64

CMake Error at tools/cmake/preset/default.cmake:65 (message):
  Unknown EXECUTORCH_LOG_LEVEL 'fake'.  Choices: Debug, Info, Error, Fatal
Call Stack (most recent call first):
  CMakeLists.txt:53 (include)
``` 

cc @larryliu0820