Revert "Temporarily disable failing no_newline_at_eol test"

This reverts commit 4a8e887.

tests/kubernetes-e2e.rs

@@ -280,7 +280,6 @@ fn partial_merge() -> Result<(), Box<dyn std::error::Error>> {
 
 /// This test validates that vector partail message merging mechanism doesn't
 /// interfere with the non-partial messages that don't end with newline.
-#[ignore] // TODO: this is currently broken, but should be fixed before the merge
 #[test]
 fn no_newline_at_eol() -> Result<(), Box<dyn std::error::Error>> {
     let _guard = lock();