Ignore flaky crashtracking test (#729)

Author: sanchda

Diff for: crashtracker/src/collector/api.rs

@@ -597,6 +597,7 @@ fn test_altstack_nouse() -> anyhow::Result<()> {
 #[cfg_attr(miri, ignore)]
 #[cfg(target_os = "linux")]
 #[test]
+#[ignore]
 fn test_waitall_nohang() -> anyhow::Result<()> {
     // This test checks whether the crashtracking implementation can cause malformed `waitall()`
     // idioms to hang.