Since warnings caused by DisAgg-related code were considered more important than those from the previously developed codebase, all non-DisAgg TSAN warnings were suppressed to simplify testing of fixes.

The process for fixing this warnings is to remove some suppressions, run full python testing under TSAN, get TSAN warnings from it, fix them properly and run testing again.

This ticket was created to fix issues caused by the lack of synchronisation for the TAILQ structure.