starknet_os: os resources test - add keccak

[dorimedini-starkware]

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[dorimedini-starkware]

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• starknet_os: os resources test - add send_message_to_l1 #14143 : 2 dependent PRs (#14144 , #14153 )
• starknet_os: os resources test - add replace_class #14142
• starknet_os: os resources test - support virtual builtins, add sha256 #14141
• starknet_os: define sha256 batch resources constants #14140
• starknet_os: os resources test - add keccak #14139 👈 (View in Graphite)
• starknet_os: os resources test - add 3 more syscalls #14138
• starknet_os: os resources test - remove all fee transfer syscalls #14137
• starknet_os: os resources test - add emit event #14136
• starknet_os: os resources test - add meta tx #14135
• starknet_os: os resources test - measure linear factor, add deploy #14134
• starknet_os: os resources test - create fixed deployable account #14173
• starknet_os: os resources test - library call #14129
• starknet_os: initial test, measure call contract resources #14128
• blockifier_test_utils: add OS resources measurement contract #14126 : 1 other dependent PR (#14127 )
• blockifier: regenerate VC JSONs #14133
• blockifier: raw VC to_string_pretty #14132
• blockifier: raw VC deterministic map order #14131
• blockifier: raw VC serde equivalence test #14130
• main

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[reviewable-StarkWare]

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PR Summary

Medium Risk
Changes syscall resource accounting and OS program hashes used for client-side proving and fee estimation; incorrect values would break consensus alignment on costs or allowed OS builds.

Overview
Extends the OS resources regression path so Keccak is measured like other syscalls: the Cairo1 OsResourcesTestContract invokes keccak_syscall twice (empty input for base cost, 17× u64 for one round), and test_os_resources_regression treats Keccak as a linear-factor syscall whose per-round cost is recorded under KeccakRound (base aligned to syscall base gas).

Versioned constants / OS artifacts are refreshed to match: KeccakRound n_steps 281 → 315, Cairo KECCAK_ROUND_COST_GAS_COST 171707 → 175107, new os / virtual_os hashes in program_hash.json, and the second allowed virtual OS program hash updated in OS Cairo constants and blockifier_versioned_constants_0_14_3.json (plus the 0.14.2→0.14.3 diff regression snippet).

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[Yoni-Starkware]

@Yoni-Starkware reviewed 6 files and all commit messages, and made 1 comment.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on dorimedini-starkware).