WIP: OCPNODE-4521: Promote AdditionalStorageConfig feature gate to Default

Promote the AdditionalStorageConfig feature gate from
TechPreviewNoUpgrade/DevPreviewNoUpgrade to the Default feature set,
making additional layer stores, image stores, and artifact stores
generally available in OpenShift 5.0.

Signed-off-by: Sascha Grunert <sgrunert@redhat.com>

Author: saschagrunert

features/features.go

@@ -325,7 +325,7 @@ var (
 						contactPerson("saschagrunert").
 						productScope(ocpSpecific).
 						enhancementPR("https://github.com/openshift/enhancements/pull/1934").
-						enable(inDevPreviewNoUpgrade(), inTechPreviewNoUpgrade()).
+						enable(inDefault(), inOKD(), inTechPreviewNoUpgrade(), inDevPreviewNoUpgrade()).
 						mustRegister()
 
 	FeatureGateUpgradeStatus = newFeatureGate("UpgradeStatus").