24.8.8 Backport PR #68694 Thread pool: move thread creation out of lock#573

Enmk merged 1 commit intocustomizations/24.8.8Altinity/ClickHouse:customizations/24.8.8from

backports/24.8.8/thread_pool_thread_creation_out_of_lockAltinity/ClickHouse:backports/24.8.8/thread_pool_thread_creation_out_of_lockCopy head branch name to clipboard