Pass SUBNET URL to console (#18503)

When minio runs with MINIO_CI_CD=on, it is expected to communicate
with the locally running SUBNET. This is happening in the case of MinIO
via call home functionality. However, the subnet-related functionality inside the
console continues to talk to the SUBNET production URL. Because of this,
the console cannot be tested with a locally running SUBNET.

Set the env variable CONSOLE_SUBNET_URL correctly in such cases. 
(The console already has code to use the value of this variable
as the subnet URL)

cmd/callhome.go

@@ -157,15 +157,11 @@ func performCallhome(ctx context.Context) {
 }
 
 const (
-	healthURL    = "https://subnet.min.io/api/health/upload"
-	healthURLDev = "http://localhost:9000/api/health/upload"
+	subnetHealthPath = "/api/health/upload"
 )
 
 func sendHealthInfo(ctx context.Context, healthInfo madmin.HealthInfo) error {
-	url := healthURL
-	if globalIsCICD {
-		url = healthURLDev
-	}
+	url := globalSubnetConfig.BaseURL + subnetHealthPath
 
 	filename := fmt.Sprintf("health_%s.json.gz", UTCNow().Format("20060102150405"))
 	url += "?filename=" + filename