Migration to remove TotalHotkeyColdkeyStakesThisInterval

[sam0x17]

The TotalHotkeyColdkeyStakesThisInterval doesn't exist anymore, but it existed previously as

    pub type TotalHotkeyColdkeyStakesThisInterval<T: Config> = StorageDoubleMap<
        _,
        Identity,
        T::AccountId,
        Identity,
        T::AccountId,
        (u64, u64),
        ValueQuery,
        DefaultStakesPerInterval<T>,
    >;

subtensor/pallets/subtensor/src/lib.rs

Line 755 in 8f39a58

pub type TotalHotkeyColdkeyStakesThisInterval<T: Config> = StorageDoubleMap<

The storage needs to be cleaned up as we never had a migration to remove these entries.