starknet_os: os resources test - extract setup_test_builder

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• starknet_os: os resources test - invoke tx constant factor #14146 : 2 dependent PRs (#14147 , #14415 )
• starknet_os: os resources test - extract setup_test_builder #14145 👈 (View in Graphite)
• starknet_os: os resources test - add secp syscalls #14144 : 1 other dependent PR (#14255 )
• starknet_os: os resources test - add send_message_to_l1 #14143 : 1 other dependent PR (#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
• main

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PR Summary

Low Risk
Test-only refactor in os_resources_test.rs with no production or runtime behavior changes.

Overview
Refactors OS resources flow tests by pulling shared harness setup into setup_test_builder and an OsResourcesTestSetup return type.

The helper centralizes deploying and funding the OS-resources account contract, forcing step-tracking via min_sierra_version_for_sierra_gas, declaring/deploying the stable measurement contract, and advancing to the next block. test_fee_transfer_syscalls and test_os_resources_regression now call it instead of duplicating that logic; the regression test passes Some(&raw_vc) so block context versioned constants are asserted against the loaded VC, while the fee-transfer test uses None.

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