HYBIM-952 Rename .galileo dir

[ridhima-splunk]

Overridden directory to .splunk in SplunkAOConfig.
.galileo creation will also exist from the parent GalileoConfig but a note to ignore it has been added.

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())
"

[github-actions]

All contributors have signed the CLA ✍️ ✅
_{Posted by the CLA Assistant Lite bot.}

[ridhima-splunk]

I have read the CLA Document and I hereby sign the CLA