[srp-server] notify advertising proxy of host/service expiration (#6248)

There is an issue that the SRP host or service are not deregistered by
the Advertising Proxy when the host or service is expired. This is
because we didn't notifies the Advertising Proxy of the host/service
expiration. This commit fixes this issue and adds tests for it.

tests/scripts/thread-cert/node.py

@@ -2741,9 +2741,10 @@ class LinuxHost():
         #
         for line in self.bash(f'cat /tmp/{host_name}'):
             elements = line.split()
-            if not elements or len(elements) < 6 or not elements[4].startswith(host_name):
+            fullname = f'{host_name}.local.'
+            if fullname not in elements:
                 continue
-            addresses.append(elements[5].split('%')[0])
+            addresses.append(elements[elements.index(fullname) + 1].split('%')[0])
 
         logging.debug(f'addresses of {host_name}: {addresses}')