fix: add back the override Execute() of WatchCmd, InfoCmd, ConfigCmd #2693
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In https://github.com/OpenAtomFoundation/pika/pull/2533/files, the override Execute() of WatchCmd, InfoCmd, ConfigCmd has been deleted only for simplicity, but those override function has their own unique purpose: avoding calling the Execute() implimented by their base class "Cmd"
PS: No obvious bugs were found, but adding these methods back would be more secure.