PS-9293, PS-9328: Revert of fix for PS-7221: Bug #100402 (crash on se… (8.0 version). #5401
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…lect Sys_var_tz::session_value_ptr)
Reverting Percona Server's version of the fix which is no longer necessary. Upstream fixed this issue in a different, more complex, but also probably more clean way in their fix for bug#31168097 "SIG 6 ASSERTION `0' IN TIME_ZONE_UTC::GET_NAME AT TZTIME.CC:1182".
See: mysql/mysql-server@1f8c02e
The test case for this issue is kept around.