perf(eventstore): redefine current sequences index (#9142)

# Which Problems Are Solved

On Zitadel cloud we found changing the order of columns in the
`eventstore.events2_current_sequence` index improved CPU usage for the
`SELECT ... FOR UPDATE` query the pusher executes.

# How the Problems Are Solved

`eventstore.events2_current_sequence`-index got replaced

# Additional Context

closes https://github.com/zitadel/zitadel/issues/9082

cmd/setup/config.go

@@ -129,6 +129,7 @@ type Steps struct {
 	s40InitPushFunc                         *InitPushFunc
 	s42Apps7OIDCConfigsLoginVersion         *Apps7OIDCConfigsLoginVersion
 	s43CreateFieldsDomainIndex              *CreateFieldsDomainIndex
+	s44ReplaceCurrentSequencesIndex         *ReplaceCurrentSequencesIndex
 }
 
 func MustNewSteps(v *viper.Viper) *Steps {