Support traversal projects #612

Job	Run time
Build on ubuntu-latest for repo global.json	1m 53s
Build on ubuntu-latest for repo global.json	1m 53s
Build on ubuntu-latest for 6.0 stable	3m 51s
Build on ubuntu-latest for 6.0 stable	3m 51s
Build on ubuntu-latest for 7.0 preview	2m 36s
Build on ubuntu-latest for 7.0 preview	2m 26s
Build on windows-latest for repo global.json	3m 27s
Build on windows-latest for repo global.json	3m 27s
Build on windows-latest for 6.0 stable	3m 19s
Build on windows-latest for 6.0 stable	3m 19s
Build on windows-latest for 7.0 preview	3m 31s
Build on windows-latest for 7.0 preview	3m 31s
Build on macOS-latest for repo global.json	3m 17s
Build on macOS-latest for repo global.json	3m 17s
Build on macOS-latest for 6.0 stable	2m 26s
Build on macOS-latest for 6.0 stable	2m 26s
Build on macOS-latest for 7.0 preview	8m 8s
Build on macOS-latest for 7.0 preview	8m 8s
	1h 4m 46s

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