Kafka-connect : many commit Timeout in a row never fail the connector

### Apache Iceberg version

1.7.1

### Query engine

Kafka Connect

### Please describe the bug 🐞

My connector was failing to commit during multiples hours , I detected it thanks to the consumer group lag

but the connector never failed , so it look like there is not a max-retry policy on the commit timeout

Would be great to have this and be able to custom this value

Thanks all

### Willingness to contribute

- [ ] I can contribute a fix for this bug independently
- [ ] I would be willing to contribute a fix for this bug with guidance from the Iceberg community
- [ ] I cannot contribute a fix for this bug at this time

Start by locating the Kafka Connect commit handling and its timeout retry behavior. Reproduce or trace consecutive commit timeouts, then verify that a configurable maximum retry policy causes the connector to fail instead of continuing indefinitely.

Written by the indexing model from the issue text.