New contrib/fixeddecimal: add support for Cloudberry #3536

Job	Run time
check-skip	3s
prepare-test-matrix	4s
Build Apache Cloudberry RPM	14m 8s
RPM Install Test Apache Cloudberry	2m 27s
ic-good-opt-on	29m 1s
ic-good-opt-off	27m 8s
pax-ic-good-opt-off	23m 7s
pax-ic-isolation2-opt-off	23m 2s
pax-ic-isolation2-opt-on	22m 54s
pax-ic-good-opt-on	27m 7s
ic-expandshrink	4m 53s
ic-resgroup-v2	20m 5s
ic-gpcontrib	4m 23s
ic-cbdb-parallel	27m 52s
ic-isolation2-hot-standby	3m 46s
ic-parallel-retrieve-cursor	4m 29s
ic-singlenode	9m 14s
ic-isolation2	36m 57s
ic-fixme	4m 21s
ic-diskquota	10m 9s
ic-isolation2-crash	5m 5s
ic-contrib	5m 16s
Generate Apache Cloudberry Build Report	3s
	5h 5m 34s

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