Automated Flaky Test Fixes

[google-labs-jules]

Identified and fixed a flaky test in implants/lib/eldritch/src/sys/exec_impl.rs.

Flaky Test: sys::exec_impl::tests::test_sys_exec_disown_no_defunct
Root Cause: The test used nix::sys::wait::wait() which waits for any child process. In a multi-threaded test environment (default for cargo test), this caused a race condition where the test might reap a child from another thread/test, or have its child reaped by another test. This led to get_zombie_child_processes finding unexpected zombies or failing to find the expected process state.
Fix: Replaced wait() with waitpid(child, None) to ensure the specific child process spawned by the test is reaped, eliminating the race condition.
Verification: Ran the test 50 times in a loop with 100% pass rate.

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PR created automatically by Jules for task 1420386500648440290 started by @KCarretto

[google-labs-jules]

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[hulto]

This should be fine.