Remove u64 leader schedule

[bamrith]

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[Copilot]

Pull Request Overview

This PR removes the u64-based leader schedule implementation from the codebase and simplifies the leader election mechanism to only use U256-based weighted round-robin scheduling. The key changes include removing the Epoch parameter from the get_leader trait method and eliminating the staking_activation configuration that previously determined which algorithm to use.

• Simplified the LeaderElection trait by removing the epoch parameter from get_leader method
• Removed u64-based leader schedule generation and the associated staking_activation epoch configuration
• Updated WeightedRoundRobin to use Default trait instead of new() constructor

Reviewed Changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
monad-validator/src/leader_election.rs	Removed Epoch parameter from get_leader trait method signature and cleaned up imports
monad-validator/src/weighted_round_robin.rs	Removed staking_activation field, replaced new() with Default impl, removed u64-based functions (randomize, generate_random_validator_u64), simplified get_leader implementation, and removed obsolete test
monad-validator/src/simple_round_robin.rs	Removed unused _epoch parameter from get_leader implementation and cleaned up imports
monad-testutil/src/proposal.rs	Updated get_leader call site to remove epoch argument
monad-state/src/lib.rs	Updated get_leader call sites and changed instantiation to use WeightedRoundRobin::default()
monad-node/src/main.rs	Changed WeightedRoundRobin instantiation to use default() instead of new(staking_activation)
monad-node/examples/ledger-tail.rs	Removed unused ChainConfig and MonadChainConfig imports, removed staking activation lookup code, updated leader election instantiation to use default()
monad-debugger/src/graphql/mod.rs	Updated get_leader call sites to remove epoch argument
monad-consensus/tests/proposal.rs	Removed unused _epoch parameter from test implementation of LeaderElection trait
monad-consensus/src/validation/signing.rs	Updated all get_leader call sites and changed test instantiations to use WeightedRoundRobin::default()
monad-consensus-state/src/lib.rs	Updated all get_leader call sites throughout the consensus state machine to remove epoch argument
monad-blocksync/src/blocksync.rs	Updated test get_leader call site to remove epoch argument

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