Make the multi-value slice permanent (#15414)

* Remove Old State Paths

* Changelog

* Gazelle

* Lint

* Fix State Tests

* fix tests, update native state code

* move ErrOutOfBounds error from consensus types to mvslice

* fix TestStreamEvents_OperationsEvents

* add missing gc to fuzz tests

* more test fixes

* build fix

---------

Co-authored-by: nisdas <nishdas93@gmail.com>

config/features/config.go

@@ -40,7 +40,6 @@ const disabledFeatureFlag = "Disabled feature flag"
 // Flags is a struct to represent which features the client will perform on runtime.
 type Flags struct {
 	// Feature related flags.
-	EnableExperimentalState             bool // EnableExperimentalState turns on the latest and greatest (but potentially unstable) changes to the beacon state.
 	WriteSSZStateTransitions            bool // WriteSSZStateTransitions to tmp directory.
 	EnablePeerScorer                    bool // EnablePeerScorer enables experimental peer scoring in p2p.
 	EnableLightClient                   bool // EnableLightClient enables light client APIs.
@@ -189,12 +188,6 @@ func ConfigureBeaconChain(ctx *cli.Context) error {
 		return err
 	}
 
-	cfg.EnableExperimentalState = true
-	if ctx.Bool(disableExperimentalState.Name) {
-		logEnabled(disableExperimentalState)
-		cfg.EnableExperimentalState = false
-	}
-
 	if ctx.Bool(writeSSZStateTransitionsFlag.Name) {
 		logEnabled(writeSSZStateTransitionsFlag)
 		cfg.WriteSSZStateTransitions = true