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>

beacon-chain/state/testing/getters_validator.go

@@ -15,5 +15,5 @@ func VerifyBeaconStateValidatorAtIndexReadOnlyHandlesNilSlice(t *testing.T, fact
 	require.NoError(t, err)
 
 	_, err = st.ValidatorAtIndexReadOnly(0)
-	assert.Equal(t, state.ErrNilValidatorsInState, err)
+	assert.ErrorContains(t, "index 0 out of bounds", err)
 }