Improve the performance of CitusHasBeenLoaded function for a database that does not do CREATE EXTENSION citus but load citus.so. #4256

Job	Run time
get_postgres_versions_from_file	6s
rpm_build_tests (oraclelinux-7, 14)	3m 42s
rpm_build_tests (oraclelinux-7, 15)	3m 7s
rpm_build_tests (oraclelinux-7, 16)	3m 12s
rpm_build_tests (oraclelinux-8, 14)	2m 53s
rpm_build_tests (oraclelinux-8, 15)	3m 13s
rpm_build_tests (oraclelinux-8, 16)	2m 57s
rpm_build_tests (centos-7, 14)	3m 24s
rpm_build_tests (centos-7, 15)	2m 52s
rpm_build_tests (centos-7, 16)	3m 55s
rpm_build_tests (almalinux-8, 14)	3m 3s
rpm_build_tests (almalinux-8, 15)	2m 36s
rpm_build_tests (almalinux-8, 16)	2m 36s
rpm_build_tests (almalinux-9, 14)	2m 54s
rpm_build_tests (almalinux-9, 15)	3m 52s
rpm_build_tests (almalinux-9, 16)	3m 48s
deb_build_tests (debian-buster-all, 14)	4m 5s
deb_build_tests (debian-buster-all, 15)	3m 23s
deb_build_tests (debian-buster-all, 16)	2m 51s
deb_build_tests (debian-bookworm-all, 14)	3m 41s
deb_build_tests (debian-bookworm-all, 15)	3m 22s
deb_build_tests (debian-bookworm-all, 16)	3m 19s
deb_build_tests (debian-bullseye-all, 14)	2m 50s
deb_build_tests (debian-bullseye-all, 15)	2m 48s
deb_build_tests (debian-bullseye-all, 16)	2m 53s
deb_build_tests (ubuntu-focal-all, 14)	2m 43s
deb_build_tests (ubuntu-focal-all, 15)	3m 20s
deb_build_tests (ubuntu-focal-all, 16)	3m 26s
deb_build_tests (ubuntu-jammy-all, 14)	3m 10s
deb_build_tests (ubuntu-jammy-all, 15)	3m 42s
deb_build_tests (ubuntu-jammy-all, 16)	3m 15s
deb_build_tests (ubuntu-kinetic-all, 14)	3m 15s
deb_build_tests (ubuntu-kinetic-all, 15)	4m 4s
deb_build_tests (ubuntu-kinetic-all, 16)	3m 17s
	1h 47m 34s

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