HYBIM-952 Rename .galileo dir to .splunk(new - duplicate of PR#221)

[ridhima-splunk]

Overridden directory to .splunk in SplunkAOConfig.
.galileo directory will not be created anymore, only .splunk dir will be created.

Tested with:

uv run python -c                                                                                                                                                                                                                           
from splunk_ao.config import SplunkAOConfig                                                                                                                                                                                                       
from pathlib import Path                                                                                                                                                                                                                          
                                                                                                                                                                                                                                                    
validated_home = SplunkAOConfig.set_home_dir(Path.home() / '.splunk')                                                                                                                                                                             
print('home_dir:', validated_home)                                                                                                                                                                                                                
print('exists:', validated_home.exists())