Add commit column to diff view

### Description

Hello,

I would find it useful if there would be a "commit"-column in the diff view before the "File name"-column like in the commit view in the commit dialog so that I can group files that I want to commit and don't. If there are files I don't want to commit and files I want to commit, the files listed are mixed together. So when I want to navigate through files I want to commit via the arrows I also navigate through the changes of files I do not want to commit. So I always have to select the next file I want to commit manually and then use the arrows and cannot only use the arrows.

### Use case/motivation

_No response_

### Related issues

_No response_

### Are you willing to submit a pull request?

No

Start by locating the NetBeans diff view and the commit dialog's file-list implementation, then compare how their columns and navigation are defined. The change is done when the diff view shows a commit column before File name and arrow navigation can be limited to the selected commit group; verify the behavior with the relevant diff-view tests or a manual IDE check.

Written by the indexing model from the issue text.