Add CHECK_FOR_INTERRUPTS when building pruning steps

Building the partition pruning steps for excessively complex queries
can take some time.  Add CHECK_FOR_INTERRUPTS() to
get_steps_using_prefix_recurse() to allow more timely processing of
interruptions.

Bug: #19692
Reported-by: Qifan Liu <[email protected]>
Discussion: https://postgr.es/m/[email protected]
Backpatch-through: 14

Branch
------
REL_15_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/325ef8f52821447da9b50ee6387ba2870b53610c

Modified Files
--------------
src/backend/partitioning/partprune.c | 2 ++
1 file changed, 2 insertions(+)

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