Other elements in the git panel are shown as disabled when an action is
not actionable (For example: stage all, commit). Updating the context
menu to match this behavior when an action does nothing.

|Before|After|
|--|--|

|![image](https://github.com/user-attachments/assets/e517f758-216f-4451-911b-7121dce0c53b)|![image](https://github.com/user-attachments/assets/a85905c1-2f42-44c3-8b11-2f93c8a6f686)|





Release Notes:

- Git: Improved the Git panel context menu to show actions with no
effect as disabled.