BigQuery cloud test for Iceberg catalogs

[rpdevmp]

Summary:

• Added BigQuery cloud test for Iceberg catalogs
• Currently it is using "key_value" Iceberg mode
• It supports using AWS S3 storage or GS GCP storage
• Tested multiple times with Ducktape on GCP cloud clusters
• Also, tested with bq tool on GCP and AWS clusters
• Running simple queries to verify Iceberg catalog data

Backports Required

• [x ] none - not a bug fix
• none - this is a backport
• none - issue does not exist in previous branches
• none - papercut/not impactful enough to backport
• v24.3.x
• v24.2.x
• v24.1.x

Release Notes

• none

[rpdevmp]

• Ducktape tests were done on GCP BYOC cluster, with Iceberg enabled, key_value iceberg mode
• Need to add google-cloud-bigquery to Ducktape requirements, so its available on Ducktape node. As a workaround, used this command before running tests:

sudo /opt/.ducktape-venv/bin/python3 -m pip install google-cloud-bigquery

But this is NOT a blocker for this PR. We should be able to review and merge it as tests work

As a follow up, we could extend it with other supported modes, more topics, different data formats, etc. But those enhancements are NOT part of this PR.

[rpdevmp]

@andrewhsu @andrwng
More details cloud be found at:
https://redpandadata.atlassian.net/wiki/spaces/DEVPROD/pages/1004535815/BigQuery+with+Iceberg+Catalogs+on+Redpanda+cloud+clusters