Creating a topic fails with unclear error message if topic name does not match rules

### Code of Conduct

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

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

_No response_

### VS Code version

When creating a new topic, for example with a space in the name, the error message is not very clear. It reads: "Payload Error. Invalid topic name." but the rules for topic names are not evident anywhere.

### Version of Confluent extension

_No response_

### To Reproduce

1. Click "Create Topic"
2. Give invalid name
3. Accept defaults

### Current vs. Expected behavior

I expected either:
A) the help text to provide the rules for what topic names look like
B) the error message to clarify the rules or specify the invalid character

### Relevant log output

```shell

```

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

Topics

### Additional context

_No response_