feat(redshift-driver): optimize testConnection() with just establishing connection without real query

[KSDaemon]

Optimize testConnection() with just establishing a db connection without performing the SELECT 1 query which makes serverless instances to keep running...

This also closes https://github.com/cube-js/cube/issues/8816

Check List

• [x] Tests has been run in packages where changes made if available
• [x] Linter has been run for changed code
• [ ] Tests for the changes have been added if not covered yet
• [ ] Docs have been added / updated if required

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