Factor cargo workspace graph helpers (#128) #612

Job	Run time
Test test with Bazel 9.x on windows-11-arm	7m 49s
Test test with Bazel 9.x on windows-latest	9m 23s
Test . with Bazel 8.x on ubuntu-24.04-arm	1m 20s
Test . with Bazel 8.x on ubuntu-latest	1m 27s
Test test with Bazel 9.x on ubuntu-latest	5m 57s
Test . with Bazel 9.x on ubuntu-latest	1m 17s
Test test with Bazel 9.x on ubuntu-24.04-arm	5m 22s
Test . with Bazel 9.x on ubuntu-24.04-arm	1m 12s
Test test with Bazel 8.x on ubuntu-latest	22m 26s
Test test with Bazel 8.x on ubuntu-24.04-arm	28m 27s
	1h 24m 40s

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