Apply timeout workaround for readonly Clickhouse in Exec

[begelundmuller]

This fixes an issue where our legacy metrics view generator would fail for tables on Clickhouse playground because it runs with a timeout applied in the context.

The fix here is related to the issue we previously filed here (still not fixed): ClickHouse/clickhouse-go#1681

Checklist:

• Covered by tests
• Ran it and it works as intended
• Reviewed the diff before requesting a review
• Checked for unhandled edge cases
• Linked the issues it closes
• Checked if the docs need to be updated. If so, create a separate Linear DOCS issue
• Intend to cherry-pick into the release branch
• I'm proud of this work!