starknet_os: os resources test - create fixed deployable account

[dorimedini-starkware]

No description provided.

[reviewable-StarkWare]

This change is 

[dorimedini-starkware]

• 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
• 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 - library call #14129
• starknet_os: initial test, measure call contract resources #14128
• blockifier_test_utils: add option to deploy from zero in test accounts #14258
• starknet_os_flow_tests: helper function to declare explicit classes #14257
• starknet_os: os resources test - create fixed deployable account #14173 👈 (View in Graphite)
• main

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[cursor]

PR Summary

Low Risk
Test-only artifacts and static contract loaders; no production OS or execution logic changes in this diff.

Overview
Adds a fixed, precompiled deployable account contract for Starknet OS flow tests so deployment resource measurement can use stable class hashes and bytecode instead of rebuilding contracts each run.

The contract (deployable_for_resource_measurement) is a minimal Cairo 1 account with standard __validate__ / __validate_deploy__ / __execute__, plus constructor, external, and L1 handler entry points that take variable-length Span<felt252> calldata. Sierra and CASM JSON artifacts (compiler v2.17.0) are checked in, and .gitattributes marks those JSON files as -diff like other large test resources.

special_contracts.rs exposes lazy-loaded DEPLOYABLE_FOR_RESOURCE_MEASUREMENT_CONTRACT_SIERRA and _CASM (currently #[expect(dead_code)]) and refactors existing loaders to use a shared CompilerContractClass import alias.

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[Yoni-Starkware]

@Yoni-Starkware reviewed 5 files and all commit messages, and made 1 comment.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on dorimedini-starkware).

[dorimedini-starkware]

@dorimedini-starkware reviewed 5 files and all commit messages.
Reviewable status: 5 of 6 files reviewed, all discussions resolved (waiting on yoavGrs and Yoni-Starkware).

[dorimedini-starkware]

@dorimedini-starkware reviewed 1 file.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on yoavGrs).