sync_gas_prices gets stuck on historical data, ignoring subscribed updates

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The sync_gas_prices function often fails to update L1GasPriceProvider, because L1GasPriceProvider expects its samples to be added in sequential block order, and sync_gas_prices tries twice, possibly with a gap in between:

2026-01-20T07:54:25.042247Z  WARN pathfinder_lib::state::sync::l1: Failed to add gas price sample block=24274626 error=Non-sequential block: expected 24274546, got 24274626
2026-01-20T07:54:37.842099Z  WARN pathfinder_lib::state::sync::l1: Failed to add gas price sample block=24274627 error=Non-sequential block: expected 24274546, got 24274627
2026-01-20T07:54:48.901591Z  WARN pathfinder_lib::state::sync::l1: Failed to add gas price sample block=24274628 error=Non-sequential block: expected 24274546, got 24274628