crosschain: Use FindBallot in TSS voter

[kingpinXD]

Replace the following piece of code with the FindBallot function.
` ballot, found := k.zetaObserverKeeper.GetBallot(ctx, index)
if !found {
var voterList []string

	for _, nodeAccount := range k.zetaObserverKeeper.GetAllNodeAccount(ctx) {
		voterList = append(voterList, nodeAccount.Operator)
	}
	ballot = observerTypes.Ballot{
		Index:                "",
		BallotIdentifier:     index,
		VoterList:            voterList,
		Votes:                observerTypes.CreateVotes(len(voterList)),
		ObservationType:      observerTypes.ObservationType_TSSKeyGen,
		BallotThreshold:      sdk.MustNewDecFromStr("1.00"),
		BallotStatus:         observerTypes.BallotStatus_BallotInProgress,
		BallotCreationHeight: ctx.BlockHeight(),
	}
}`

• Find Ballot would need to be modified to accept ballot thresholds
• Threshold for different types of ballots needs to maintained in the params

[lumtis]

The observer list per chain is removed is it correct? Is the ObserverMapper structure still used?

Also I think this logic should be abstracted inside the observer keeper

for _, nodeAccount := range k.zetaObserverKeeper.GetAllNodeAccount(ctx) {
	voterList = append(voterList, nodeAccount.Operator)
}

voterList = k.zetaObserverKeeper.GetAllOperators()

I would also think we could have method NewBallot in observer keeper

func NewBallot(index string) Ballot {
  voterList = voterList = GetAllOperators()
  return Ballot{
		BallotIdentifier:     index,
		VoterList:            voterList,
		Votes:                observerTypes.CreateVotes(len(voterList)),
		ObservationType:      observerTypes.ObservationType_TSSKeyGen,
		BallotThreshold:      sdk.MustNewDecFromStr("1.00"),
		BallotStatus:        observerTypes.BallotStatus_BallotInProgress,
		BallotCreationHeight: ctx.BlockHeight(),
	}
}

Threshold for different types of ballots needs to maintained in the params

In the current implementation, we read from obsParams := k.GetParams(ctx).GetParamsForChain(chain), why changing it to sdk.MustNewDecFromStr("1.00"), do we also want to keep a unique one for all chains?

[fbac]

Closing this as won't fix, as the msg for vote TSS differs from the other messages, and does not carry ChainID, which makes it not possible to use FindBallot.