ci: add second_deadlock_stack=1 to TSAN options

This is mentioned in the developer notes, but isn't present in
`TSAN_OPTIONS`, resulting in:
```bash
WARNING: ThreadSanitizer: lock-order-inversion (potential deadlock) (pid=60508)
  Cycle in lock order graph: M0 (0xffff98e02208) => M1 (0xffff98e0cbe8) => M2 (0xffff98e0cd98) => M0
<snip>

  Hint: use TSAN_OPTIONS=second_deadlock_stack=1 to get more informative warning message
```

Add it, for (potentially) more informative output, when failures
occur. Checked that adding does output more information.

ci/test/03_test_script.sh

@@ -10,7 +10,7 @@ set -ex
 
 export ASAN_OPTIONS="detect_leaks=1:detect_stack_use_after_return=1:check_initialization_order=1:strict_init_order=1"
 export LSAN_OPTIONS="suppressions=${BASE_ROOT_DIR}/test/sanitizer_suppressions/lsan"
-export TSAN_OPTIONS="suppressions=${BASE_ROOT_DIR}/test/sanitizer_suppressions/tsan:halt_on_error=1"
+export TSAN_OPTIONS="suppressions=${BASE_ROOT_DIR}/test/sanitizer_suppressions/tsan:halt_on_error=1:second_deadlock_stack=1"
 export UBSAN_OPTIONS="suppressions=${BASE_ROOT_DIR}/test/sanitizer_suppressions/ubsan:print_stacktrace=1:halt_on_error=1:report_error_type=1"
 
 echo "Number of available processing units: $(nproc)"