fix: plan should terminate when deleting public plan proposal

[jaybxyz]

Summary of Bug

Current logic in DeletePublicPlanProposal doesn't terminate plan. It should send all remaining coins in the pool to the termination address and mark the plan as terminated.

Tasks

• Add TerminationPlan logic in DeletePublicPlanProposal
• Handle an edge case where FarmingPoolAddress and TerminationAddress are equal
• Add test code to cover this case

References

farming/x/farming/keeper/proposal_handler.go

Lines 220 to 235 in f994143

	// DeletePublicPlanProposal delets public plan proposal once the governance proposal is passed.
	func (k Keeper) DeletePublicPlanProposal(ctx sdk.Context, proposals []*types.DeleteRequestProposal) error {
	for _, p := range proposals {
	plan, found := k.GetPlan(ctx, p.GetPlanId())
	if !found {
	return sdkerrors.Wrapf(sdkerrors.ErrNotFound, "plan %d is not found", p.GetPlanId())
	}
	k.RemovePlan(ctx, plan)
	logger := k.Logger(ctx)
	logger.Info("removed public ratio plan", "plan_id", plan.GetId())
	}
	return nil
	}

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For Admin Use

• Not duplicate issue
• Appropriate labels applied
• Appropriate contributors tagged
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