Support re-exported contracts in build-external (#1773) #8248

Job	Run time
scarb-metadata compatibility check	41s
check-rust	3m 53s
build test linux x86-64	4m 21s
check-website	12s
build test windows x86-64	8m 2s
doc tests	3m 24s
test linux x86-64 1/8	21m 51s
test linux x86-64 2/8	25m 47s
test linux x86-64 3/8	20m 15s
test linux x86-64 4/8	18m 21s
test linux x86-64 5/8	15m 22s
test linux x86-64 6/8	16m 2s
test linux x86-64 7/8	12m 13s
test linux x86-64 8/8	14m 45s
test windows x86-64 1/8	19m 51s
test windows x86-64 2/8	23m 16s
test windows x86-64 3/8	20m 15s
test windows x86-64 4/8	15m 59s
test windows x86-64 5/8	15m 50s
test windows x86-64 6/8	15m 9s
test windows x86-64 7/8	11m 26s
test windows x86-64 8/8	14m 4s
	5h 0m 59s

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