fix(tests): exclude & reject type 3 transactions on Monad

[pdobacz]

Small tweak to properly "unsupport" blob txs in Monad forks.

Selectively mark tx type 3 tests as excluded on Monad forks to fill a small coverage gap.

Surfaced during #53 and cherry-picked there

Greptile Summary

The PR consistently removes type-3 blob transaction support from Monad forks and updates fixture selection and exception mapping accordingly.

• Rejects encoded type-3 transactions as unknown during decoding.
• Rejects constructed blob transactions before generic transaction validation.
• Adds focused coverage for both sufficient-gas and insufficient-intrinsic-gas cases.
• Replaces unconditional skips with Monad-specific validity markers, retaining upstream coverage.

Confidence Score: 5/5

The PR appears safe to merge; no actionable correctness, security, or repository-rule issues remain.

The prior inconsistency is fully fixed because constructed blob transactions are now rejected before intrinsic-gas and other generic checks, while encoded type-3 transactions are rejected during decoding. The updated exception mapping and Monad-specific test markers are consistent with those paths.

Important Files Changed

Filename	Overview
packages/testing/src/execution_testing/client_clis/clis/execution_specs.py	Maps unsupported transaction-type failures to the specification's TransactionTypeError output.
src/ethereum/forks/monad_eight/transactions.py	Rejects encoded and constructed blob transactions before secondary validation can change their error classification.
src/ethereum/forks/monad_nine/transactions.py	Applies the same type-3 rejection behavior to Monad Nine.
src/ethereum/forks/monad_ten/transactions.py	Applies the same type-3 rejection behavior to Monad Ten.
src/ethereum/forks/monad_next/transactions.py	Applies the same type-3 rejection behavior to Monad Next.
tests/monad_eight/typed_transactions/test_blob_transaction.py	Verifies unsupported-type precedence for blob transactions with both sufficient and insufficient intrinsic gas.
tests/istanbul/eip1344_chainid/test_chainid.py	Narrows type-3 exclusion to Monad forks instead of skipping valid upstream coverage.
tests/prague/eip7623_increase_calldata_cost/test_execution_gas.py	Uses Monad-specific validity markers for unsupported type-3 cases.
tests/prague/eip7623_increase_calldata_cost/test_transaction_validity.py	Restricts the type-3 validity exclusion to Monad Eight and its descendants.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Transaction input] --> B{Encoded bytes?}
    B -->|Yes| C{Type byte is 3?}
    C -->|Yes| D[Raise TransactionTypeError]
    C -->|No| E[Decode supported transaction]
    B -->|No| F{Constructed BlobTransaction?}
    F -->|Yes| D
    F -->|No| G[Run generic transaction validation]
    E --> G

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_{Reviews (2): Last reviewed commit: "feat(monad): reject blob transactions on..." | Re-trigger Greptile}

[QEDK]

LGTM.