ci: linux64_asan fails on Qt QDBusConnectionManager leak #7561

Summary

The new linux64_asan job fails in qt/test/test_dash-qt after all Qt tests pass because LeakSanitizer reports four small allocations from Qt's QDBusConnectionManager::executeConnectionRequest:

==52718==ERROR: LeakSanitizer: detected memory leaks
...
#3 QDBusConnectionManager::executeConnectionRequest(...)
...
SUMMARY: AddressSanitizer: 86 byte(s) leaked in 4 allocation(s).
FAIL qt/test/test_dash-qt (exit status: 1)

The existing test/sanitizer_suppressions/lsan entry for QDBusConnectionPrivate suppresses related Qt allocations but does not match these four stacks.

Evidence

This reproduces on develop itself at e25f9925df4f0bafaf5f6d13ac34e14bdc8eecc9:

• develop CI run: https://github.com/dashpay/dash/actions/runs/31222050806
• failing linux64_asan-build / Build source job: https://github.com/dashpay/dash/actions/runs/31222050806/job/93009844804

The identical 86-byte/four-allocation leak also appears on PR #7479, whose merge base is exactly that develop commit:

• PR CI run: https://github.com/dashpay/dash/actions/runs/31236188823
• failing job: https://github.com/dashpay/dash/actions/runs/31236188823/job/93049578835

In both jobs, every Qt test reports success before LeakSanitizer terminates the test binary.

Root cause

This is a dependency-level Qt DBus shutdown leak, not a test assertion or Dash wallet failure. The leak stack is entirely in Qt/DBus connection management, and the same signature and byte count occur on unmodified develop.

Reproduction

1. Check out e25f9925df4f0bafaf5f6d13ac34e14bdc8eecc9.
2. Run the repository's linux64_asan CI target (the configuration in ci/test/00_setup_env_native_asan.sh, with leak detection enabled and test/sanitizer_suppressions/lsan).
3. Observe that qt/test/test_dash-qt passes its test cases, then exits 1 with the four QDBusConnectionManager::executeConnectionRequest allocations above.

Suggested direction

Add a narrowly scoped LSAN suppression for this Qt dependency stack (or ensure the Qt DBus connection manager is shut down before process exit), then verify no Dash-owned leaks are hidden.