apollo_consensus_orchestrator: add SNIP-35 module edge case tests

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• 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 👈 (View in Graphite)
• apollo_consensus_orchestrator: add SNIP-35 e2e test #13821
• apollo_consensus_manager: wire STRK/USD oracle into consensus manager #13820
• apollo_consensus_orchestrator: add SNIP-35 fee_proposal validation #13819
• apollo_consensus_orchestrator: wire SNIP-35 fee_proposal into build_proposal #13818
• apollo_consensus_orchestrator: add fee_actual floor to EIP-1559 gas price calculation #13824
• apollo_consensus_orchestrator: add SNIP-35 fee_proposals sliding window #13817
• apollo_consensus_orchestrator,apollo_consensus_manager: add strk_exchange_rate_oracle field to deps #13823
• apollo_consensus_orchestrator: add SNIP-35 metrics #13816
• apollo_consensus_orchestrator: add SNIP-35 module tests #13815
• apollo_consensus_orchestrator: add SNIP-35 module #13854
• starknet_api: include fee_proposal_fri in proposal commitment hash #13814 : 1 other dependent PR (#13908 )
• apollo_storage: add fee_proposal_fri migrators and bump blocks version to 6.1 #13936 : 1 other dependent PR (#13934 )
• starknet_api: add fee_proposal_fri to BlockHeaderWithoutHash and PartialBlockHashComponents #13822
• apollo_protobuf: add fee_proposal_fri to ProposalInit #13812 : 2 other dependent PRs (#13811 , #13935 )
• main

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PR Summary

Low Risk
Test-only changes that add coverage for overflow/saturation and adversarial/outlier scenarios in SNIP-35 fee computations; no production logic is modified.

Overview
Adds several edge-case tests for SNIP-35 fee computation helpers (compute_fee_actual, compute_fee_target, compute_fee_proposal).

The new coverage targets extreme u128 values/overflow resistance, non-panicking behavior under saturated arithmetic, monotonicity of compute_fee_target as STRK price changes, and robustness of the median against a single outlier.

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