fix: simplify background heal and trigger heal items early (#9928)

Bonus fix during versioning merge one of the PR was missing
the offline/online disk count fix from #9801 port it correctly
over to the master branch from release.

Additionally, add versionID support for MRF

Fixes #9910
Fixes #9931

cmd/admin-handlers-config-kv.go

@@ -173,7 +173,7 @@ func (a adminAPIHandlers) GetConfigKVHandler(w http.ResponseWriter, r *http.Requ
 	}
 
 	cfg := globalServerConfig
-	if globalSafeMode {
+	if newObjectLayerFn() == nil {
 		var err error
 		cfg, err = getValidConfig(objectAPI)
 		if err != nil {