Improve git status colors in file explorer


### Discussed in https://github.com/apache/hop/discussions/5284

![Image](https://github.com/user-attachments/assets/6038e71c-18b5-4c50-ba2b-212eed277a03)

![Image](https://github.com/user-attachments/assets/22b3e974-0f35-4d0d-ba87-f7ef65cd0c1f)