Allow bootstrapping stdlib from source #539

Job	Run time
Test test with Bazel 9.x on windows-latest	10m 43s
Test test with Bazel 9.x on windows-11-arm	8m 56s
Test . with Bazel 8.x on ubuntu-latest	18s
Test test with Bazel 9.x on ubuntu-latest	5m 42s
Test . with Bazel 8.x on ubuntu-24.04-arm	24s
Test . with Bazel 9.x on ubuntu-latest	18s
Test test with Bazel 9.x on ubuntu-24.04-arm	5m 4s
Test test with Bazel 8.x on ubuntu-24.04-arm	11m 9s
Test . with Bazel 9.x on ubuntu-24.04-arm	23s
Test test with Bazel 8.x on ubuntu-latest	10m 38s
	53m 35s

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