Peter Zhu 89dc79eeba Ignore thread not suspended warning messages in LSAN
When a process with multiple threads is forked, LSAN outputs warning
messages to stderr like:

    ==276855==Running thread 276851 was not suspended. False leaks are possible.

We should ignore messages like this in tests.
2025-10-11 18:03:17 -04:00
..
2025-09-18 10:12:55 -07:00