Remove unsafeLogUnredactedQueries for now

[Copilot]

Removes the unsafeLogUnredactedQueries config toggle and stops logging query text and URL search params entirely — no opt-in, no leakage.

Summary

• Removed unsafeLogUnredactedQueries from public config types and all connection param wiring
• Debug logs no longer include raw query= in request_params (always redacted via clone + delete)
• Error logs no longer include search_params at all
• Added regression test asserting sensitive query parameter binding values (param_<name>=<value>) never appear in any log entry, even at TRACE level and under connection failure conditions

Checklist

• Unit and integration tests covering the common scenarios were added
• A human-readable description of the changes was provided to include in CHANGELOG
• For significant changes, documentation in https://github.com/ClickHouse/clickhouse-docs was updated with further explanations or tutorials

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