Add disabled Amsterdam spec tests

[ryankeleti]

To be added in the mega Amsterdam PR stack

[Copilot]

🟢 Approval recommended

The changes are limited to test fixture wiring/exclusions and keep the suite intentionally disabled, with only a minor exclusion/comment consistency issue to address.

Pull request overview

This PR updates the MONAD_NEXT Amsterdam spec-test harness to pull a consolidated fixtures bundle and keeps the entire Amsterdam suite disabled by default (to be enabled later as part of a larger PR stack).

Changes:

• Replace separate Amsterdam + EIP-7981 fixture downloads with a single combined fixtures tarball.
• Disable all Amsterdam blockchain tests via a BlockchainTests.* exclusion wildcard, keeping the ctest job in a controlled WILL_FAIL state.
• Remove the extra --blockchain-tests directory argument tied to the deleted EIP-7981 fixture project.

Verdict: CORRECT

File summaries

File	Description
test/ethereum_test/exclude/MONAD_NEXT_amsterdam.cmake	Switch exclusion list to fully disable the suite via BlockchainTests.* (and adjust notes around future re-enable).
test/ethereum_test/CMakeLists.txt	Point ExternalProject to a consolidated fixtures release and simplify the MONAD_NEXT Amsterdam test invocation accordingly.

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 1
• Review effort level: Lite

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