[SPARK-3741] Add afterExecute for handleConnectExecutor

Sorry. I found that I forgot to add `afterExecute` for `handleConnectExecutor` in #2593.

Author: zsxwing <zsxwing@gmail.com>

Closes #2794 from zsxwing/SPARK-3741 and squashes the following commits:

a0bc4dd [zsxwing] Add afterExecute for handleConnectExecutor