Infinite log retention

### Search before asking

- [x] I searched in the [issues](https://github.com/apache/fluss/issues) and found nothing similar.

### Fluss version

main (development)

### Please describe the bug 🐞

Configuration issue with TTL: The documentation states that we can use -1 for table.log.ttl, but setting this value throws an InvalidConfigException:

```
org.apache.fluss.exception.InvalidConfigException: Invalid value for config 'table.log.ttl'...
```

https://github.com/apache/fluss/pull/2621

### Solution

_No response_

### Are you willing to submit a PR?

- [x] I'm willing to submit a PR!

Start by comparing the documentation for table.log.ttl with the configuration validation that produces InvalidConfigException, using the related pull request 2621 for context. Done means setting table.log.ttl to -1 works without the exception and the documented behavior matches the runtime behavior.

Written by the indexing model from the issue text.