Remove Sky tests that we don't intend to port to the new world

sky/tests/lowlevel/abarth-expected.txt

Index: sky/tests/lowlevel/abarth-expected.txt
diff --git a/sky/tests/lowlevel/abarth-expected.txt b/sky/tests/lowlevel/abarth-expected.txt
deleted file mode 100644
index c50215a922ec94ff25a6db812ef7429590ad8d8a..0000000000000000000000000000000000000000
--- a/sky/tests/lowlevel/abarth-expected.txt
+++ /dev/null
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