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-constants tuning for syscall metering; no runtime auth or execution-path changes beyond updated EmitEvent step counts.

Overview
EmitEvent is now covered by the Starknet OS syscall resource regression test instead of being skipped as unmeasurable.

The measurement contract invokes emit_event_syscall with fixed keys/data. The flow test asserts the emitted event, expects two EmitEvent syscall traces (measurement + fee transfer), and pops the fee-transfer trace so it does not skew OS overhead. UNMEASURABLE_SYSCALLS no longer includes EmitEvent.

blockifier_versioned_constants_0_14_4.json updates EmitEvent OS n_steps from 61 to 47 to match the new measurement.

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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.