chore: drop the remove-group upgrade handler

audit-fixes targets mainnet, which starts from a fresh genesis where x/group
is never mounted, so no store deletion is required. The StoreUpgrades handler
belongs on the testnet branch, where donut has an existing group store.

Author: 0xNilesh

app/upgrades.go

@@ -7,13 +7,10 @@ import (
 
 	"github.com/pushchain/push-chain-node/app/upgrades"
 	"github.com/pushchain/push-chain-node/app/upgrades/noop"
-	removegroup "github.com/pushchain/push-chain-node/app/upgrades/remove-group"
 )
 
 // Upgrades list of chain upgrades
-var Upgrades = []upgrades.Upgrade{
-	removegroup.NewUpgrade(),
-}
+var Upgrades = []upgrades.Upgrade{}
 
 // RegisterUpgradeHandlers registers the chain upgrade handlers
 func (app *ChainApp) RegisterUpgradeHandlers() {