BUG: Refactoring Lazy Ballot Initialization

### Is there an existing issue for this?

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### Issue Description ✍️

### Currently, Election.sol contains the exact same logic in both userVote and ccipVote to initialize the ballot if it hasn't been yet.

### Modifier Fix: we can create an ensureBallot modifier to handle this logic automatically.

@Ronnieraj37 please check this out , feel free to assign

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