Optimize log when using VerticaOperator

[sudohainguyen]

This PR is about passing False to log_sql argument when initializing VerticaHook to execute VerticaOperator. Related to issue #25456, SQL queries are duplicated in task log. I'm trying to disable one of them.

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[boring-cyborg]

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[potiuk]

Sounds reasonable.

[boring-cyborg]

Awesome work, congrats on your first merged pull request!