apollo_l1_gas_price: rename EthToStrkOracle references to PriceOracle

[sirandreww-starkware]

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[sirandreww-starkware]

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• apollo_integration_tests,deployment: rename dummy_eth_to_strk_oracle binary to dummy_price_oracle #13875
• apollo_l1_gas_price: rename EthToStrkOracle references to PriceOracle #13809 👈 (View in Graphite)
• apollo_l1_gas_price: rename eth_to_strk_oracle_test.rs to price_oracle_test.rs #13808
• apollo_l1_gas_price: rename ETH_TO_STRK_QUANTIZATION to ORACLE_PRICE_DECIMALS #13807
• apollo_l1_gas_price: rename eth_to_strk_oracle.rs to price_oracle.rs #13806
• apollo_l1_gas_price: rename EthToStrkOracleClient to PriceOracleClient #13805
• apollo_l1_gas_price_config: rename EthToStrkOracleConfig to PriceOracleConfig #13804
• apollo_l1_gas_price_types: rename get_eth_to_fri_rate to get_price on provider client #13803
• apollo_l1_gas_price_types: rename EthToStrkOracleClientTrait to PriceOracleClientTrait #13802
• apollo_l1_gas_price_types: rename EthToStrkOracleClientError to PriceOracleClientError #13801
• main

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PR Summary

Low Risk
Purely a naming/log-message cleanup (error variant + log string) with no behavioral changes to gas pricing or consensus flows; low risk aside from minor metric/error-label name mismatches in downstream consumers.

Overview
Renames consensus-orchestrator error variants/messages from EthToStrkOracle to PriceOracle in both proposal building and validation, aligning terminology with PriceOracleClientError.

Updates the PriceOracleClient::new startup log line to say Creating PriceOracleClient instead of Creating EthToStrkOracleClient.

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