OTA-1581: Promote UpgradeStatus to Default

OTA uses `UpgradeStatus` feature gate name to identify the CLI-side functionality described in OTA-1577 (`oc adm upgrade status` command).

The `UpgradeStatus` feature gate does not enable any cluster-side functionality (neither API changes or any controller code). The actual functionality will be enabled in `oc` through openshift/oc#2063. The `UpgradeStatus` feature gate thus serves only as a vehicle to perform the data-driven promotion decision by tying the appropriate test coverage to this name so that the promotion criteria can be automatically checked.

Therefore, this PR serves as a formal decision record only, and after it merges, it means openshift/oc#2063 is allowed to merge.

Author: petr-muller

features/features.go

@@ -430,7 +430,7 @@ var (
 					contactPerson("pmuller").
 					productScope(ocpSpecific).
 					enhancementPR(legacyFeatureGateWithoutEnhancement).
-					enableIn(configv1.DevPreviewNoUpgrade, configv1.TechPreviewNoUpgrade).
+					enableIn(configv1.DevPreviewNoUpgrade, configv1.TechPreviewNoUpgrade, configv1.Default).
 					mustRegister()
 
 	FeatureGateTranslateStreamCloseWebsocketRequests = newFeatureGate("TranslateStreamCloseWebsocketRequests").