Cannot change auth type when Updating an existing direct connection

### Code of Conduct

- [x] I agree to follow this project's Code of Conduct

### On what operating system are you seeing the problem?

macOS (Apple/arm64)

### VS Code version

1.98

### Version of Confluent extension

lts

### To Reproduce

1. Make a direct connection with any auth type (except none)
2. Open the form to Edit and change the auth type, enter the values, submit
3. Note that the update cannot be saved, errors in logs

### Current vs. Expected behavior

expect that I can change auth type when editing

### Relevant log output

```shell

```

### Which area(s) are affected? (Select all that apply)

Connections

### Additional context

_No response_