Fix Execution Speed Estimation Bug and Improve Usability in ClickHouse Client

Fix bug when query speed estimation can be incorrect and the limit of min_execution_speed may not work or work incorrectly if the query is throttled by max_network_bandwidth, max_execution_speed or priority settings. Change the default value of timeout_before_checking_execution_speed to non-zero, because otherwise the settings min_execution_speed and max_execution_speed have no effect. This fixes #11297. This fixes #5732. This fixes #6228. Usability improvement: avoid concatenation of exception message with progress bar in clickhouse-client. #11296 (alexey-milovidov).