Tests ~ (fix) always check out test fixtures with known LF line endings

- fixes windows test failures
- avoids `git` platform-dependent conversion of line endings for checkout of test fixtures (*tests/examples/...*)

tests/.gitattributes

@@ -1,3 +1,11 @@
+# force LF EOLs for test fixtures
+examples/** text=auto eol=lf
+snapshots/** text=auto eol=lf
+
+# BAT/CMD files always need CRLF EOLs
+*.[Bb][Aa][Tt] text eol=crlf
+*.[Cc][Mm][Dd] text eol=crlf
+
 examples/* linguist-vendored
 snapshots/* linguist-vendored
 benchmarks/* linguist-vendored