Develop the 2nd scenario about the tokamak tally

[Zena-park]

1. when a voter changes their delegation after delegated user voted
2. when a voter changes their delegation during voting
3. when a voter removes their delegation and vote themselves

[Zena-park]

npx hardhat test test/z.2.scenario.ts

• gas price: 10 gwei
• Voting is based on the block snapshot with voting delay applied.
• During voting, the block must already be after a voting delay, so changing the delegation during(after) voting has no impact.
• Even when voting on your own, you delegate to yourself.
• test code