Add BUILD files for test/.../build/lib{buildeventstream,skylark/...,util/...,windows/..., and others}

Also enable a number of tests that were not previously running on windows, but
that work just fine when enabled.

RELNOTES: None.
PiperOrigin-RevId: 302085725
diff --git a/src/test/java/com/google/devtools/build/lib/packages/BUILD b/src/test/java/com/google/devtools/build/lib/packages/BUILD
index b1b171b..0c3c666 100644
--- a/src/test/java/com/google/devtools/build/lib/packages/BUILD
+++ b/src/test/java/com/google/devtools/build/lib/packages/BUILD
@@ -13,6 +13,7 @@
     srcs = glob(["**"]) + [
         "//src/test/java/com/google/devtools/build/lib/packages/util/mock:srcs",
     ],
+    visibility = ["//src:__subpackages__"],
 )
 
 java_library(