Kernel: Add WaitQueue::wait_forever and it use it for all infinite waits.

In preparation for marking BlockingResult [[nodiscard]], there are a few
places that perform infinite waits, which we never observe the result of
the wait. Instead of suppressing them, add an alternate function which
returns void when performing and infinite wait.

Kernel/Net/NE2000NetworkAdapter.cpp

@@ -392,7 +392,7 @@ void NE2000NetworkAdapter::send_raw(ReadonlyBytes payload)
     }
 
     while (in8(REG_RW_COMMAND) & BIT_COMMAND_TXP)
-        m_wait_queue.wait_on({}, "NE2000NetworkAdapter");
+        m_wait_queue.wait_forever("NE2000NetworkAdapter");
 
     disable_irq();
     size_t packet_size = payload.size();