test: add update_rewards old delegator flow

[arad-starkware]

This change is 

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Note

Implements consensus block rewards based on average block duration with configurable bounds, integrates caching in staking, adds RewardSupplier EIC, and updates docs/tests accordingly.

• Contracts – Reward Supplier:
  • Add update_current_epoch_block_rewards returning per-block STRK/BTC rewards using yearly mint and measured avg block duration (avg_block_duration).
  • Track timing via block_snapshot and clamp with BlockDurationConfig; expose get_block_duration_config and set_block_duration_config (app governor only).
  • New storage/consts: avg_block_duration, block_snapshot, block_duration_config, BLOCK_DURATION_SCALE, DEFAULT_*, use shared SECONDS_IN_YEAR.
  • New EIC RewardSupplierEIC initializing avg/min/max block duration with validation.
  • New errors: BLOCK_DURATION_OVERFLOW, INVALID_{BLOCK_NUMBER,BLOCK_TIMESTAMP,MIN_MAX_BLOCK_DURATION,AVG_BLOCK_DURATION}.
• Contracts – Staking:
  • Compute per-epoch block rewards via Reward Supplier; cache in block_rewards with last_calculated_epoch.
  • On set_consensus_rewards_first_epoch, pre-initialize block rewards; update_rewards now uses cached per-block rewards.
• Docs:
  • Document new Reward Supplier APIs (update_current_epoch_block_rewards, get_block_duration_config, set_block_duration_config), new error INVALID_MIN_MAX_BLOCK_DURATION, and struct BlockDurationConfig; clarify calculate_current_epoch_rewards usage.
• Tests/Utils:
  • Extensive tests for block-reward path, config validation, EIC upgrade, mixed token pools, epoch/block timing, migration flows.
  • Test helpers for advancing blocks/time, reward calculations with avg block duration, and EIC declarations.
• Deps:
  • Bump starkware_utils/testing git revs.

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[arad-starkware]

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• test: add update_rewards old delegator flow #94 👈 (View in Graphite)
• test: add update_rewards transition with balance change flow #93
• test: add update_rewards several blocks delegation rewards test #92
• test: add disable_rewards intermittently flow #91
• test: add update_rewards epoch length flow #90
• test: add update_rewards same epoch flow #89
• test: add update_rewards staker intent flow #88 : 1 other dependent PR (#95 )
• test: add update_rewards empty pools flow #87
• test: add update_rewards btc pools flow #86
• noa/staking/v3/rs-eic

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[noa-starkware]

Reviewable status: 0 of 3 files reviewed, 2 unresolved discussions (waiting on @arad-starkware)

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src/flow_test/flows.cairo line 9103 at r1 (raw file):

        system.stake(:staker, amount: stake_amount, pool_enabled: true, :commission);
        let pool = system.staking.get_pool(:staker);
        system.delegate(:delegator, :pool, amount: delegated_amount);

Add BTC delegate if version is V2 and test his rewards

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src/flow_test/flows.cairo line 9124 at r1 (raw file):

        let delegated_amount = self.delegated_amount.unwrap();
        let pool = self.pool.unwrap();

Do we want add one attest here?