The initial TSAN test format coverage was introduced as part of WT-15784. While implementing this, I initially tried to enable the format test using the common `stress-test-disagg` tag, but all tasks in that job were hanging and eventually killed due to timeouts. As a result, it was decided to first introduce limited format test support via `format-stress-test-tsan` and `format-stress-test-disagg-leader-tsan` tsan specific jobs.

This ticket is intended to investigate why the tests are hanging and whether it is possible to run the format test under TSAN using the common tag. Probably the reason is somehow connected that (almost?) all the tasks included to this tag use `format.sh` while the TSAN specific jobs use ./t directly.

Scope of the ticket:

• Investigate whether stress-test-disagg can be enabled for the TSAN variants (see FIXME comments).
• If so, enable it and remove the existing TSAN-specific Evergreen jobs.