starknet_os: os resources test - add emit event

[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
• 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 👈 (View in Graphite)
• 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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[reviewable-StarkWare]

This change is 

[cursor]

PR Summary

Low Risk
Test and versioned-constant tuning for syscall metering; no runtime execution or auth changes.

Overview
EmitEvent is now part of the OS resources regression suite instead of being skipped as unmeasurable.

The Cairo1 OsResourcesTestContract invokes emit_event_syscall during __execute__, and os_resources_test asserts the emitted event (keys/data) while peeling off the extra EmitEvent trace from fee transfer so syscall overhead can be attributed correctly. EmitEvent is removed from UNMEASURABLE_SYSCALLS, and blockifier_versioned_constants_0_14_4.json updates measured EmitEvent OS cost from 61 to 47 steps (range-check builtin unchanged).

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[Yoni-Starkware]

@Yoni-Starkware reviewed 4 files and all commit messages, and made 2 comments.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on dorimedini-starkware).

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crates/starknet_os_flow_tests/src/os_resources_test.rs line 220 at r1 (raw file):

    // Extract syscall resources consumed, per (measurable) syscall.
    // There should be two events emitted: the first is the syscall we are measuring, and the second
    // is the last syscall in the tx, emitted from the fee transfer. Pop the second event.

You can run this tx with trivial fee bounds and make this test a bit cleaner

Code quote:

    // There should be two events emitted: the first is the syscall we are measuring, and the second
    // is the last syscall in the tx, emitted from the fee transfer. Pop the second event.