[#23655] YSQL: Handle SIGTERM in pg_cron

Summary:
Use `quickdie` as `SIGTERM` handler since the process gets stuck on `SPI_execute_with_args` in `InsertJobRunDetail` when `die` or `pg_cron_sigterm` is used.

Fixes #23655
Jira: DB-12566

Test Plan:
Jenkins

ybd fastdebug --cxx-test integration-tests_pg_cron-test --gtest_filter PgCronTest.ChangeCronDB -n 100 --tp 1

Reviewers: tnayak

Reviewed By: tnayak

Subscribers: yql, svc_phabricator, ybase

Differential Revision: https://phorge.dev.yugabyte.com/D37591

src/postgres/third-party-extensions/pg_cron/src/pg_cron.c

@@ -591,7 +591,7 @@ PgCronLauncherMain(Datum arg)
 	pqsignal(SIGHUP, pg_cron_sighup);
 	pqsignal(SIGINT, SIG_IGN);
 	/* YB Note: Exit immediately. */
-	pqsignal(SIGTERM, die);
+	pqsignal(SIGTERM, quickdie);
 	pqsignal(SIGQUIT, quickdie);
 
 	/* We're now ready to receive signals */