tests: add invalid cancun blob tests as valid.

tests/prague/eip7742_uncouple_blob_count/__init__.py

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+"""Cross-client EIP-7742 Tests."""

tests/prague/eip7742_uncouple_blob_count/spec.py

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+"""
+Defines EIP-4844 specification constants and functions.
+"""
+
+from dataclasses import dataclass
+from hashlib import sha256
+from typing import Optional
+
+from ethereum_test_tools import Transaction
+
+
+@dataclass(frozen=True)
+class BlockHeaderBlobGasFields:
+    """
+    A helper class for the blob gas fields in a block header.
+    """
+
+    excess_blob_gas: int
+    blob_gas_used: int
+
+
+@dataclass(frozen=True)
+class ReferenceSpec:
+    """
+    Defines the reference spec version and git path.
+    """
+
+    git_path: str
+    version: str
+
+
+ref_spec_7742 = ReferenceSpec(
+    "EIPS/eip-7742.md", "f0eb6a364aaf5ccb43516fa2c269a54fb881ecfd"
+)