[cnd] cnd.debugger.common2 should use JNA

### Apache NetBeans version

Apache NetBeans latest daily build

### What happened

`cnd/cnd.debugger.common2` uses a small binary `GdbKillProc.exe` that allows interrupting `gdb` gracefully. This may be done with JNA directly, making mainteinance easier (and reducing a binary in the distribution).

### How to reproduce

_No response_

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

No

### Operating System

Windows

### JDK

Any

### Apache NetBeans packaging

Own source build

### Anything else

_No response_

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

Yes

### Code of Conduct

Yes

Inspect the cnd/cnd.debugger.common2 module and the GdbKillProc.exe integration first, then trace how it interrupts gdb on Windows. Replace the small binary's role with direct JNA usage, remove the distribution dependency, and verify the own source build still handles graceful gdb interruption.

Written by the indexing model from the issue text.