Disable Sonar quality gates to avoid checks appearing as failures

Currently Sonar check fails when it detects problem in a PR or master branch based on the current configuration of quality gates. The reviewers are free to enforce/ignore the error at will but given that errors in CI may be interpreted differently by people they should be disabled for the moment.

The goal of this ticket is to add a new empty quality gate in Sonar specific for Calcite that never fails no matter what Sonar detects.