Use palloc_array() in pltcl and plperl to avoid overflow

Some of these could overflow on 32-bit systems with the right input.
Convert all cases where we called palloc() with multiplication to fix
them. Not all of them were bugs, but it's better to be safe than
sorry.

Reported-by: Tulya Project, Team Dhiutsa, Bitecope Technologies Private Ltd
Backpatch-through: 14
Security: CVE-2026-14677

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/776467301ea9edff9d1f5be975a5da6b2229ac77
Author: Heikki Linnakangas <[email protected]>

Modified Files
--------------
src/pl/plperl/SPI.xs   |  6 +++---
src/pl/plperl/plperl.c | 26 +++++++++++++-------------
src/pl/tcl/pltcl.c     | 16 ++++++++--------
3 files changed, 24 insertions(+), 24 deletions(-)

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