Remove unused concourse/* from source #771

Job	Run time
check-skip	2s
prepare-test-matrix-deb	9s
Build Apache Cloudberry DEB	15m 27s
DEB Install Test Apache Cloudberry	1m 59s
pax-ic-deb-good-opt-off	24m 0s
pax-ic-deb-good-opt-on	27m 40s
ic-deb-gpcontrib	3m 31s
ic-cbdb-parallel	28m 41s
ic-deb-good-opt-off	26m 48s
ic-deb-good-opt-on	29m 56s
ic-deb-contrib	4m 47s
Generate Apache Cloudberry Build Report	3s
	2h 43m 3s

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