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This commit adds tests to verify the computation of the nesting level for two code paths: the planner hook and the ExecutorFinish() hook. The nesting level is essential to save a correct "toplevel" status for the added PGSS entries. The author has noticed that removing the manipulations of nesting_level in these two code paths did not cause the tests to complain, meaning that we never had coverage for the assumptions taken by the code. Author: Sami Imseih <samimseih@gmail.com> Discussion: https://postgr.es/m/CAA5RZ0uK1PSrgf52bWCtDpzaqbWt04o6ZA7zBm6UQyv7vyvf9w@mail.gmail.com