tests: Turn off enable_frontend_peek_sequencing in CI for now

Author: ggevay

misc/python/materialize/mzcompose/__init__.py

@@ -196,7 +196,7 @@ def get_variable_system_parameters(
         ),
         VariableSystemParameter(
             "enable_frontend_peek_sequencing",
-            "true",
+            "false",
             ["true", "false"],
         ),
         VariableSystemParameter(