fix: make sure to correctly initialize health checks (#17765)

health checks were missing for drives replaced since

- HealFormat() would replace the drives without a health check
- disconnected drives when they reconnect via connectEndpoint()
  the loop also loses health checks for local disks and merges
  these into a single code.
- other than this separate cleanUp, health check variables to avoid
  overloading them with similar requirements.
- also ensure that we compete via context selector for disk monitoring
  such that the canceled disks don't linger around longer waiting for
  the ticker to trigger.
- allow disabling active monitoring.

cmd/storage-rest-client.go

@@ -828,7 +828,7 @@ func (client *storageRESTClient) Close() error {
 }
 
 // Returns a storage rest client.
-func newStorageRESTClient(endpoint Endpoint, healthcheck bool) *storageRESTClient {
+func newStorageRESTClient(endpoint Endpoint, healthCheck bool) *storageRESTClient {
 	serverURL := &url.URL{
 		Scheme: endpoint.Scheme,
 		Host:   endpoint.Host,
@@ -837,7 +837,7 @@ func newStorageRESTClient(endpoint Endpoint, healthcheck bool) *storageRESTClien
 
 	restClient := rest.NewClient(serverURL, globalInternodeTransport, newCachedAuthToken())
 
-	if healthcheck {
+	if healthCheck {
 		// Use a separate client to avoid recursive calls.
 		healthClient := rest.NewClient(serverURL, globalInternodeTransport, newCachedAuthToken())
 		healthClient.NoMetrics = true