Remove ShardingForkVersion/Epoch from config (#11868)

* remove ShardingForkVersion/Epoch from config

* update magic value counting config params

* skip the sharding params, which we disavow

we wanted to remove these upstream and may well do some day but right
now it's too big of a mess to untangle.

Co-authored-by: Kasey Kirkham <kasey@users.noreply.github.com>
Co-authored-by: prylabs-bulldozer[bot] <58059840+prylabs-bulldozer[bot]@users.noreply.github.com>

network/forks/fork_test.go

@@ -185,8 +185,6 @@ func TestRetrieveForkDataFromDigest(t *testing.T) {
 	cfg.AltairForkEpoch = 10
 	cfg.BellatrixForkVersion = []byte{'A', 'B', 'C', 'Z'}
 	cfg.BellatrixForkEpoch = 100
-	cfg.ShardingForkVersion = []byte{'A', 'B', 'C', 'Y'}
-	cfg.ShardingForkEpoch = 1000
 	cfg.InitializeForkSchedule()
 	params.OverrideBeaconConfig(cfg)
 	genValRoot := [32]byte{'A', 'B', 'C', 'D'}