Undo/Redo not working after sending request

### Expected Behavior

Clicking Ctrl + z should undo the most recent change in the request body edit section after sending a request. It seems the undo history is cleared after sending a request. I'm always going back and forth between editing and sending. Undo is very important for this flow.

### Actual Behavior

Ctrl + z is doing nothing. It seems he undo history is cleared out after sending request.

### Reproduction Steps

1. Make a change to the body
2. send request
3. click Ctrl+z
4. Nothing happens (should undo previous change)

### Is there an existing issue for this?

- [x] I have searched the [issue tracker](https://www.github.com/Kong/insomnia/issues) for this problem.

### Which sync method do you use?

- [ ] Git sync.
- [ ] Insomnia Cloud sync.
- [ ] Local only

### Additional Information

Seems this was an [old issue](https://github.com/Kong/insomnia/issues/7352), not sure if it ever got really resolved or the bug is back.

### Insomnia Version

12.3.1

### What operating system are you using?

Windows

### Operating System Version

Windows 11

### Installation method

insomnia.rest

### Last Known Working Insomnia version

_No response_

Reproduce the issue in Insomnia by editing a request body, sending it, and pressing Ctrl+z. Trace the request-body editor and the send flow to find where undo history is reset; done means the most recent body change can be undone after sending.

Written by the indexing model from the issue text.