Currently some examples aren't included to the regular TSAN CI testing because they generate a lot of warnings. The decision was to suppress all the warnings for now and enable the example to be able to solve these warnings step by step and check the fixes in regular CI by removing the suppressions.

All the warnings should be included into `tsan_warnings.supp` under the corresponding umbrella tickets:

• ex_all - https://jira.mongodb.org/browse/WT-14856 
• ex_backup - https://jira.mongodb.org/browse/WT-13074 

The idea is to continue resolving warnings from the suppression list iteratively, merging them separately, and creating a new ticket for each PR to reduce the scope of the umbrella tickets.