psql: Fix psql slash option leaks

psql_scan_slash_option() returns a malloc'd string, but \getresults,
\gset in pipeline mode, \restrict, and \unrestrict did not free it
after consuming or copying the value.

Free these option strings after use.

Backpatch to all supported versions. In v17 and older, only \restrict
and \unrestrict are affected, so those branches need only that part of
the fix.

Author: Fujii Masao <[email protected]>
Reviewed-by: Chao Li <[email protected]>
Discussion: 
https://postgr.es/m/CAHGQGwEh3R3=1tx_a5=ftdj+ycuwxwmen6bg_yt4b5p+he7...@mail.gmail.com
Backpatch-through: 14

Branch
------
REL_18_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/8753b6904e861f15c4889c7e0623580e357860b9

Modified Files
--------------
src/bin/psql/command.c | 8 ++++++++
1 file changed, 8 insertions(+)

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