starknet_transaction_prover: add committer utils unit tests

[avi-starkware]

Covers state_maps_to_committer_state_diff (empty / nonces / storage /
compiled class hashes) and validate_virtual_os_state_diff (valid storage,
valid nonce, and rejection of storage deletion / contract deployment /
contract declaration).

[reviewable-StarkWare]

This change is 

[avi-starkware]

• starknet_transaction_prover: add deployment health docs and smoke script #14052
• starknet_transaction_prover: make RPC error spec test exhaustive via enum #14051
• starknet_transaction_prover: add TLS integration tests #14050
• starknet_transaction_prover: add ServiceConfig validation tests #14049
• starknet_transaction_prover: add CORS validation unit tests #14048
• starknet_transaction_prover: add prover input validation unit tests #14047
• starknet_transaction_prover: add committer utils unit tests #14046 👈 (View in Graphite)
• main-v0.14.3

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[cursor]

PR Summary

Low Risk
Test-only changes with no production logic modified.

Overview
Adds committer_utils_test and wires it into the running test module.

New unit tests cover state_maps_to_committer_state_diff (empty maps and preservation of nonces, storage, and compiled class hashes) and validate_virtual_os_state_diff (accepts empty/nonzero storage/nonce updates; rejects storage deletion, contract deployments, and contract declarations with expected InvalidStateDiff messages).

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[github-actions]

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• Started at 2026-05-31T10:39:09Z