ctb: Prevent echidna calling fallback and initialize

packages/contracts-bedrock/contracts/echidna/FuzzResourceMetering.sol

@@ -14,7 +14,7 @@ contract EchidnaFuzzResourceMetering is ResourceMetering {
         initialize();
     }
 
-    function initialize() public initializer {
+    function initialize() internal initializer {
         __ResourceMetering_init();
     }
 

packages/contracts-bedrock/echidna.yaml

@@ -4,3 +4,6 @@ format: text
 # Set the timeout to 3 minutes to keep CI from getting too long.
 # The tool also adds 2 or 3 minutes before/after the actual timeout window.
 timeout: 180
+
+# Prevent calls to the (non-existent) fallback function of EchidnaFuzzResourceMetering
+filterFunctions: [EchidnaFuzzResourceMetering.*fallback*()]