feat(tests): Additional MIP-8 coverage

[pdobacz]

Closes ENG-1132

Fills gaps in coverage found by @mijovic . All tests confirmed to pass via runloop on v0.16.1

Greptile Summary

This PR expands MIP-8 test coverage for pageified storage commitments, fork migration, and SSTORE growth accounting.

• Adds paged-root comparisons, full-page clearing checks, and commitment-scheme dispatch coverage.
• Verifies untouched storage is recommitted across the Monad Nine-to-Ten transition.
• Covers negative page-growth counters and omission of fully zeroed pages.

Confidence Score: 5/5

The PR appears safe to merge; no concrete correctness, security, or test-validity issues remain.

The added tests use compatible storage representations, isolate gas measurements from the page under test, and exercise the intended MIP-8 commitment and growth behavior without introducing production changes.

Important Files Changed

Filename	Overview
packages/testing/src/execution_testing/forks/tests/test_paged_storage_trie.py	Adds sound comparisons against legacy slot-MPT roots and verifies that clearing a complete page restores the prior paged-storage root.
packages/testing/src/execution_testing/test_types/tests/test_alloc_prestate.py	Verifies that identical allocation contents produce roots through the selected MPT or paged commitment backend.
tests/monad_ten/mip8_pageified_storage/test_fork_transition.py	Adds transition coverage ensuring untouched pre-fork storage participates in the post-fork pageified state commitment.
tests/monad_ten/mip8_pageified_storage/test_sstore_gas.py	Adds isolated coverage for negative page-growth counters and complete removal of cleared pages.

_{Reviews (1): Last reviewed commit: "test(mip8): pin the negative state-growt..." | Re-trigger Greptile}

Context used:

• Knowledge Base — Monad Ten pageified storage