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Sessions terminated using kill command still leave behind entries in dm_exec_sessions (#3350)

https://github.com/babelfish-for-postgresql/babelfish_extensions/pull/3329 was not enough to fix abandoned rows in sys.dm_exec_sessions. Sessions terminated using kill command still leave behind an entry in sys.dm_exec_sessions.

Root cause was not executing the shmem exit hook when session terminated because of SIGTERM.

As a fix make `tds_stats_shmem_shutdown` completely similar to `pgstat_beshutdown_hook`.

Task: [BABEL-5414]

Signed-off-by: Tanzeel Khan <tzlkhan@amazon.com>

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