Kerberos authentication fails with Git in NetBeans and Git does not support local Git client fallback

### Apache NetBeans version

Apache NetBeans 28

### What happened

When attempting to use Git in NetBeans with Kerberos authentication, the credentials are not recognized, and a modal window appears with an error message. The issue seems to be related to JGit: does it support Kerberos authentication at all?
The local Git command-line tool works flawlessly. Why doesn’t NetBeans allow falling back to the system-installed Git client for authentication, as the standalone Git tool does?

### Language / Project Type / NetBeans Component

_No response_

### How to reproduce

With a Windows 11 in a microsoft domain logged with a domain user. A local git direcotry with local git client can exec:
git push origin master

Tha same action from Netbeasn 28 wont works with auth error

### Did this work correctly in an earlier version?

No / Don't know

### Operating System

Windows 11

### JDK

JDK 25 (Default)

### Apache NetBeans packaging

Community provided installer

### Anything else

_No response_

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

No

Start by tracing NetBeans' Git integration and its JGit authentication path, then compare it with the working system Git command-line flow on Windows 11 in a Microsoft domain. Done means Kerberos-authenticated push works in NetBeans or the requested local Git fallback is implemented and verified against the reported reproduction.

Written by the indexing model from the issue text.