apollo_integration_tests,apollo_deployments: prime strk_to_usd_oracle overlays

[ShahakShama]

Goal: PR 4 of 6 in the stack moving the STRK/USD oracle into
L1GasPriceProvider. Lands BEFORE the orchestrator behavior flip
(PR 5) so that every test and deployment overlay already points
the new strk_to_usd_oracle_config.url_header_list at a working
endpoint. When PR 5 lands, integration runs immediately exercise
the new path with realistic data instead of silently freezing
fee_proposal at fee_actual.

Change summary:

• create_node_config takes a new strk_to_usd_oracle_config: ExchangeRateOracleConfig argument and plumbs it into
  L1GasPriceProviderConfig.
• Callers in flow_test_setup.rs and integration_test_manager.rs
  reuse the same dummy spawn_local_eth_to_strk_oracle URL for both
  oracles (the handler returns a constant rate, so semantically
  equivalent).
• SecretsConfigOverride in apollo_deployments::test_utils gains
  a strk_to_usd_oracle_config.url_header_list field so the
  generated secrets file covers the new private parameter.
• Deployment app-config presets
  (l1_gas_price_provider_config.json,
  replacer_l1_gas_price_provider_config.json) gain the same three
  per-oracle overrides (lag_interval_seconds=900, max_cache_size=100,
  query_timeout_sec=10) for STRK/USD, mirroring eth_to_strk.

Decision points:

• One dummy oracle process serving both feeds instead of spawning two.
  The fake handler is rate-agnostic — same response shape, single port
  allocation, same join handle. If we ever need rate-specific dummy
  values, splitting into two processes is a localized change.

Action required after merge (cannot run from this sandbox):

• cargo run --bin update_apollo_node_config_schema to regenerate
  config_secrets_schema.json (it gains a new private parameter
  from PR 1's earlier addition).
• cargo run --bin deployment_generator to regenerate
  testing_secrets.json with the new strk_to_usd entry from
  SecretsConfigOverride.

Co-Authored-By: Claude Opus 4.7 (1M context) noreply@anthropic.com

[cursor]

PR Summary

Low Risk
Test-only configuration plumbing with no production logic changes in the shown diff; reuses an existing mock oracle endpoint.

Overview
Integration tests now wire strk_to_usd_oracle_config into node setup ahead of the L1 gas price provider behavior change. create_node_config takes a second ExchangeRateOracleConfig and sets it on L1GasPriceProviderConfig alongside the existing ETH→STRK oracle.

Flow and integration test managers build that config by reusing the same local dummy oracle URL as ETH→STRK (one spawn_local_eth_to_strk_oracle process serves both feeds). Call sites pass the new argument through unchanged test topology.

This keeps integration runs exercising a populated url_header_list for STRK/USD when the provider starts using it, instead of leaving the field empty.

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[reviewable-StarkWare]

This change is 

[ShahakShama]

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• apollo_consensus_orchestrator: add SNIP-35 integration TODO doc #13982
• apollo_consensus_orchestrator: tmp dirty tests for SNIP-35 (NOT FOR MERGE) #13857
• apollo_l1_gas_price,apollo_l1_gas_price_config: move exchange_rate_decimals const to config #13881
• apollo_consensus_orchestrator: add SNIP-35 proposer-validator symmetry tests #13856
• apollo_consensus_orchestrator: add SNIP-35 module edge case tests #13855
• apollo_consensus_orchestrator,apollo_consensus_manager: route STRK/USD via L1GasPriceProvider #14161
• apollo_integration_tests,apollo_deployments: prime strk_to_usd_oracle overlays #14160 👈 (View in Graphite)
• apollo_l1_gas_price_types,apollo_l1_gas_price: expose get_strk_to_usd_rate #14159
• apollo_l1_gas_price: hold strk_to_usd oracle client + strk_to_usd_rate #14158
• apollo_l1_gas_price: parameterize ExchangeRateOracleClient by metric set #14199
• apollo_l1_gas_price_config,apollo_node: add strk_to_usd_oracle_config #14157
• apollo_consensus_orchestrator: add SNIP-35 fee_proposal validation #13819 : 1 other dependent PR (#13820 )
• apollo_consensus_orchestrator: include fee_proposal_fri in proposal commitment hash #13949
• apollo_starknet_client: read fee_proposal_fri from feeder gateway #13986
• apollo_consensus_orchestrator: wire SNIP-35 fee_proposal into cende blob #13985
• apollo_consensus_orchestrator: wire SNIP-35 fee_proposal into build_proposal #13818
• apollo_consensus_orchestrator,apollo_consensus_manager: move SNIP-35 bootstrap to pre-consensus #14061
• apollo_node_config: made validation only node hold full state #14122
• main

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[matanl-starkware]

@matanl-starkware reviewed 3 files and all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on ShahakShama).