Fix per-tuple memory leak in partition tuple routing

Some operations were being done in a longer-lived memory context,
causing intra-query leaks.  It's not noticeable unless you're doing a
large COPY, but if you are, it eats enough memory to cause a problem.

Co-authored-by: Kohei KaiGai <[email protected]>
Co-authored-by: Amit Langote <[email protected]>
Co-authored-by: Álvaro Herrera <[email protected]>
Discussion: 
https://postgr.es/m/CAOP8fzYtVFWZADq4c=kotaqgdrhwfng+anepezccyxqxpvb...@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/1c9bb02d8ec1d5b1b319e4fed70439a403c245b1

Modified Files
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src/backend/executor/execPartition.c | 57 ++++++++++++++++++++++++++----------
1 file changed, 41 insertions(+), 16 deletions(-)

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