While auditing/working on migration stuff, Alexander Popiak caught an error in one of our Democracy migrations on Kusama. There are still some old storage items under Democracy.VoteOf. I opened this motion to kill the storage prefix for this item via a Root call to System pallet.

Anyone can verify the existing storage items by querying Kusama under the prefix: 0xf2794c22e353e9a839f12faab03a911b02a7afbcd5cd4ad2c68bbc63279ae52e

This is equal to xxhash("Democracy") + xxhash("VoteOf") which you can see in the democracy pallet is not used. It was a typo in our migration code that would normally have cleaned this storage up.

 Schedule the currently externally-proposed majority-carries referendum to be tabled
 immediately. If there is no externally-proposed referendum currently, or if there is one
 but it is not a majority-carries referendum then it fails.

 The dispatch of this call must be `FastTrackOrigin`.

 - `proposal_hash`: The hash of the current external proposal.
 - `voting_period`: The period that is allowed for voting on this proposal. Increased to
   `FastTrackVotingPeriod` if too low.
 - `delay`: The number of block after voting has ended in approval and this should be
   enacted. This doesn't have a minimum amount.

 Emits `Started`.

 # <weight>
 - Complexity: `O(1)`
 - Db reads: `NextExternal`, `ReferendumCount`
 - Db writes: `NextExternal`, `ReferendumCount`, `ReferendumInfoOf`
 - Base Weight: 30.1 µs
 # </weight>

 Kill all storage items with a key that starts with the given prefix.

 **NOTE:** We rely on the Root origin to provide us the number of subkeys under
 the prefix we are removing to accurately calculate the weight of this function.

 # <weight>
 - `O(P)` where `P` amount of keys with prefix `prefix`
 - `P` storage deletions.
 - Base Weight: 0.834 * P µs
 - Writes: Number of subkeys + 1
 # </weight>

- **Problem Statement:** The Polkadot Hackathon: APAC Edition revealed gaps in participants' understanding of Substrate, affecting the quality of hackathon submissions. The intended audience is global developers interested in the Polkadot ecosystem.
- **Significance:** The lack of foundational knowledge in Substrate among developers limits the quality and quantity of submissions, hindering the growth and vibrancy of the Polkadot ecosystem.
- **Proposed Solution:** Tribe proposes to conduct Learn-and-Earn campaigns via StackUp, a platform that rewards developers for completing tasks that enhance their skills and knowledge. The goal is to onboard 150 global developers with strong foundational knowledge and hands-on development experience.
- **Expected Outcomes:** The campaigns are expected to increase the number of quality submissions in future hackathons, thereby expanding Polkadot's active developer base and enhancing the ecosystem's vibrancy. The overall project allocation is $80,000 USD, with $50,000 USD requested for the first payment milestone.

#47 Clean up `Democracy.VoteOf` storage in Kusama

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