Kernel: Ensure jailed processes can be reaped by a jailed parent process

We were detaching from the jail process list too early. To ensure we
detach properly, leverage the remove_from_secondary_lists method
so the possibly jailed parent process can still see the dying process
and therefore clean it properly.

Kernel/Process.h

@@ -204,6 +204,8 @@ public:
 
     ~Process();
 
+    virtual void remove_from_secondary_lists();
+
     ErrorOr<NonnullRefPtr<Thread>> create_kernel_thread(void (*entry)(void*), void* entry_data, u32 priority, NonnullOwnPtr<KString> name, u32 affinity = THREAD_AFFINITY_DEFAULT, bool joinable = true);
 
     bool is_profiling() const { return m_profiling; }