ci : add older, min and dry-run options to ccache-clear (#27504)
* ci : add older, min and dry-run options to ccache-clear
Assisted-by: pi:llama.cpp/Qwen3.8-27B
* pi : add note about not wrapping lines in PR descriptions
[no ci]
Assisted-by: pi:llama.cpp/Qwen3.8-27B