Fix and run gp_exttable_fdw tests #310

Job	Run time
check-skip	9s
Build Apache Cloudberry DEB	13m 53s
prepare-test-matrix-deb	2s
DEB Install Test Apache Cloudberry	43s
ic-deb-gpcontrib	3m 5s
ic-deb-good-opt-off	25m 25s
ic-cbdb-parallel	27m 5s
ic-deb-contrib	3m 7s
ic-deb-good-opt-on	29m 10s
pax-ic-deb-good-opt-off	22m 25s
pax-ic-deb-good-opt-on	26m 39s
Generate Apache Cloudberry Build Report	2s
	2h 31m 45s

Provide feedback