Fix iceberg table detection

[ms32035]

Problem

In case the dbt project writes into multiple Snowflake databases, wrong information_schema could be queried.

Solution

Prepend the database name

Checklist

• I have read the contributing guide and understand what's expected of me
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• This PR has no interface changes (e.g. macros, cli, logs, json artifacts, config files, adapter interface, etc) or this PR has already received feedback and approval from Product or DX

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[ms32035]

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[colin-rogers-dbt]

@ms32035 can you add a changelog entry? If you have it installed you can just run changie new