fix: custom command in context menu

[abeatrix]

Issue

Currently, none of the commands from the Custom Commands menu work.

Steps to reproduce:

1. Open the Custom Command menu from the right click menu in your editor
   
2. Choose a Custom Command to run from the menu
3. None of the commands would work

This PR includes:

• Fixed the issue mentioned above
• added a back button to move from Custom Command Menu to Cody Menu

Also made the following changes in our package.json

• Rename "Smell Code" to "Find Code Smells" for clarity
• Move commands to "Ask Cody" category for better organization
• Disable duplicated commands in command palette as /doc /test /smell etc are already covered in our Commands Menu
• Organize Cody submenu into "command" and "other" groups
• Rename "Start New Thread" to "Ask Cody Inline"
• Rename "Custom Commands (Experimental)" to just "Custom Commands"
• Rename "Fixup" command to "Edit Code"

BEFORE	AFTER

Test plan

1. Start Cody from this branch
2. Open the Custom Command menu from the right-click menu in your editor
   
3. Choose a Custom Command to run from the menu
4. Command should work as expected