Include `rank_to_votes` Converter for `Vote` benchmark in `pallet-rank-collective`.

[Doordashcon]

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Description of bug

The benchmarking case for the vote extrinsic in pallet-ranked-collective were consistently failing due to manual input of VoteWeight. The issue manifested as assertion failures where the expected event tally values did not match the actual values generated during benchmark execution while configuring the Ambassador Collective.

Steps to Reproduce

Compile the current configuration for the Ambassador collective which includes a modified VoteWeight converter.

Open the compiled pallet-ranked-collective crate in your editor(i.e ~/.cargo/registry/src/index.crates.io-hash/pallet-ranked-collective-version/src/benchmarking.rs), add this logging for VoteWeight Converter and observe the different VoteWeight / Tally from the hard coded value.

#[benchmark]
fn vote() -> Result<(), BenchmarkError> {
    log::info!(target: BENCHMARK_LOG_TARGET, "Starting vote benchmark");
....
    // Simulate the rank_to_votes conversion process
    let vote_weight = if let Some(ref class) = class {
        let min_rank = T::MinRankOfClass::convert(class.clone());
        
        // Get the member's actual rank
        let member_rank = Members::<T, I>::get(&caller)
            .map(|m| m.rank)
            .unwrap_or_else(|| {
                log::error!(target: BENCHMARK_LOG_TARGET, "Member not found: {:?}", caller);
                0
            });
        
        log::info!(target: BENCHMARK_LOG_TARGET, "Member rank: {}, Min rank required: {}", member_rank, min_rank);
        
        // Calculate excess rank
        let excess = member_rank.checked_sub(min_rank).unwrap_or_else(|| {
            log::error!(target: BENCHMARK_LOG_TARGET, "Rank too low: {} < {}", member_rank, min_rank);
            0
        });
        
        log::info!(target: BENCHMARK_LOG_TARGET, "Excess rank: {}", excess);
        
        // Convert excess rank to votes
        let votes = T::VoteWeight::convert(excess);
        log::info!(target: BENCHMARK_LOG_TARGET, "Converted excess rank {} to votes: {}", excess, votes);
        
        votes
    } else {
        log::warn!(target: BENCHMARK_LOG_TARGET, "No class available, using 0 votes");
        0
    };
....