Fix signal loss by removing the signal handler in the ClickHouse engine

[wudidapaopao]

Changelog category (leave one):

• Bug Fix (user-visible misbehavior in an official stable release)

see chdb-io/chdb-go#24 and #321

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

Fix signal loss issue

Documentation entry for user-facing changes

• Documentation is written (mandatory for new features)

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