Enforce LF for YAML/JSON in testdata

Author: bobsira

.gitattributes

@@ -1,2 +1,4 @@
-# Prevent git from normalizing or converting any newline or encoding inside test data folders
-**/testdata/** text eol=lf
+# Prevent Git from altering line endings for test fixtures; enforce LF for YAML/JSON under any testdata directory.
+**/testdata/**/*.yaml text eol=lf
+**/testdata/**/*.yml  text eol=lf
+**/testdata/**/*.json text eol=lf