fix: update ethrex exception mapper for gas limit errors (ethereum#2209)

Add INVALID_GASLIMIT substring mapping. Remove GAS_USED_OVERFLOW regex
since ethrex now uses a consistent "Gas allowance exceeded" message.

Author: edg-l

packages/testing/src/execution_testing/client_clis/clis/ethrex.py

@@ -11,6 +11,9 @@ class EthrexExceptionMapper(ExceptionMapper):
     """Ethrex exception mapper."""
 
     mapping_substring = {
+        BlockException.INVALID_GASLIMIT: (
+            "Gas limit changed more than allowed from the parent"
+        ),
         TransactionException.TYPE_3_TX_MAX_BLOB_GAS_ALLOWANCE_EXCEEDED: (
             "Exceeded MAX_BLOB_GAS_PER_BLOCK"
         ),