[lldb] Disable linux test failing on bots

While we investigate it: rdar://117690727

Author: felipepiovezan

lldb/test/API/terminal/TestEditline.py

@@ -48,6 +48,7 @@ def test_left_right_arrow(self):
     @skipIfAsan
     @skipIfEditlineSupportMissing
     @skipIfEditlineWideCharSupportMissing
+    @skipIf(oslist=["linux"])
     def test_prompt_unicode(self):
         """Test that we can use Unicode in the LLDB prompt."""
         self.launch(use_colors=True, encoding="utf-8")