starknet_os: os resources test - add send_message_to_l1

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• starknet_os: os resources test - add send_message_to_l1 #14143 : 2 dependent PRs (#14144 , #14153 ) 👈 (View in Graphite)
• 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

Medium Risk
Touches fee/gas constants and OS program hashes used for proving and client compatibility, though changes are driven by regression measurement rather than new protocol logic.

Overview
Extends the OS resources regression harness so send_message_to_l1 is exercised and its OS overhead is captured like other measurable syscalls.

The Cairo1 OsResourcesTestContract now calls send_message_to_l1_syscall with an empty payload; the flow test drops SendMessageToL1 from the unmeasurable list, asserts the resulting L2→L1 message (to address 100), and refreshes 0.14.4 versioned constants: SendMessageToL1 n_steps 144 → 124 and matching SEND_MESSAGE_TO_L1_GAS_COST 14470 → 12470 in OS Cairo constants. program_hash.json, allowed virtual OS program hash slot 2, and the 0.14.3→0.14.4 diff regression snippet are updated for the rebuilt OS artifacts.

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