Did you create a REST service that will serve as the catalog?

According to the trino documentation youv'e shared, you need to connect to the REST service
iceberg.rest-catalog.uriREST server API endpoint URI (required). Example: http://iceberg-with-rest:8181
According to your example, you're connecting to the GCS bucket that isn't a REST service.

iceberg.rest-catalog.uri=https://storage.googleapis.com/<bucket_name>/thelook_ecommerce/iceberg (is this correct?)

This is an example project for a REST Catalog service: gravitino.apache you'll need to have such service to connect Trino to GCS.

To my understanding, Google has not yet exposed a REST API endpoint in its various methods of managing ICEBERG. ICEBERG on BigQuery options