build

Make `workspace.checkThirdParty` a string enum #3787

Job	Run time
compile (ubuntu-22.04, linux, linux-x64, alpine:latest, musl)	4m 23s
compile (ubuntu-20.04, linux, linux-x64, ubuntu:18.04)	5m 2s
compile (ubuntu-20.04, linux, linux-arm64, ubuntu:18.04)	5m 55s
compile (macos-11, darwin, darwin-x64)	4m 48s
compile (macos-11, darwin, darwin-arm64)	2m 53s
compile (windows-latest, windows, win32-ia32)	7m 8s
compile (windows-latest, windows, win32-x64)	5m 18s
	35m 27s

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